Word Formation & Derivatives
Prefixes, suffixes, compounds, inflections, and derived word families.
11746 words
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Some words in this topic are A2–C2 — part of Pro. A1 words are always free.
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determinate
C2
/dɪˈtɝːməˌneɪt/
not continuing to grow indefinitely at the apex
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simper
C2
/ˈsɪmpɚ/
To smile in a foolish, frivolous, self-conscious, coy, obsequious, or smug manner.
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roentgen
C2
/ˈrent.ɡən/
a non-SI unit of exposure to X-rays or gamma rays, equal to 0.000258 coulomb per kilogram of dry air
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electrolytic
C2
/ɨˌlɛk.tɹɵˈlɪ.tɪk/
of or concerned with or produced by electrolysis
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legalistic
C2
/ˌliːɡəˈlɪstɪk/
excessively concerned with the strict and literal application of laws or rules, often at the expense of their purpose
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euphemistic
C2
/ˌjuːfəˈmɪstɪk/
Using mild or indirect words to replace ones that seem harsh or offensive.
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telegraphy
C2
/təˈlɛɡɹəfi/
the practice or technology of transmitting coded messages over long distances by electrical, optical, or radio signals
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oarsman
C2
/ˈɔɹzmən/
a male rower, especially a member of a boat's racing or working crew
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fallibility
C2
/fæləˈbɪləti/
The state of being prone to error.
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preferment
C2
/pɹɪˈfəːmənt/
the act of preferring
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ichthyologist
C2
/ˌɪkθiˈɑːlədʒɪst/
a scientist or specialist who studies fish
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adulterate
C2
/əˈdʌltəɹət/
To make something weaker or lower in quality by adding another substance.
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amortize
C2
/ˈæmɚtaɪz/
to liquidate gradually
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calculative
C2
/ˈkælkjələtɪv/
concerned with calculation, especially deliberate reasoning about means and consequences
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mesmeric
C2
/mɛzˈmɛɹɪk/
So fascinating that it holds your complete attention, as if by magic.
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multitudinous
C2
/ˌməltəˈt(j)ud(ɪ)n̩əs/
Existing in multitudes or great numbers; very numerous; innumerable.
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demotic
C2
/dɪˈmɑ.tɪk/
of or for the common people
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leafless
C2
/ˈliːfləs/
Of plants or trees, without leaves.
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perambulator
C2
/pəˈræmbjəˌleɪtɚ/
a baby carriage; a chiefly British and now dated term for a pram
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coquetry
C2
/ˈkoʊkətri/
playfully flirtatious behavior intended to attract interest, often without serious romantic intent
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sweetbriar
C2
/ˈswiːtˌbraɪər/
a Eurasian wild rose with prickly stems, fragrant leaves, pink flowers, and red hips
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lineal
C2
/ˈlɪni.əl/
in a straight unbroken line of descent from parent to child
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scapular
C2
/ˈskæpjələr/
relating to the scapula or shoulder blade
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intolerably
C2
/ˌɪnˈtɑːlɝəbli/
to an unacceptable degree
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polymorphic
C2
/ˌpɑliˈmɔɹfɪk/
having or occurring in several distinct forms
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striation
C2
[stɹaɪˈeɪ.ʃən]
one of a series of narrow parallel lines, grooves, ridges, or bands
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hierophant
C2
/ˈhaɪərəˌfænt/
in ancient Greece, a priest who revealed and interpreted sacred mysteries, especially at Eleusis
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splutter
C2
/ˈsplʌtɚ/
to speak rapidly or confusedly with spitting sounds, especially from anger or excitement
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spectroscopic
C2
/ˌspɛktrəˈskɑpɪk/
relating to spectroscopy or to the production, measurement, or analysis of spectra
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relegate
C2
/ˈɹɛlɪˌɡeɪt/
To move someone or something to a lower or less important position.
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importunate
C2
/ɪmˈpɔrtʃənət/
persistently demanding or pleading, often to an annoying degree
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tautology
C2
/tɔˈtɑl.ə.d͡ʒi/
useless repetition
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unenforceable
C2
/ˌʌn.ɪnˈfɔːr.sə.bəl/
of a law, rule, or policy, impossible or impracticable to make people obey
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obstreperous
C2
/əbˈstɹɛpəɹəs/
boisterously and noisily aggressive
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pyramidal
C2
/pɪˈɹæm.ɪ.dl̩/
Pyramid-shaped.
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affability
C2
/ˌæfəˈbɪləti/
the quality of being friendly, approachable, and easy to talk to
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generalship
C2
/ˈdʒɛnɝəlˌʃɪp/
skill or performance in commanding an army and directing military operations
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blubbery
C2
/ˈblʌbəɹi/
Fat, soft, and wobbly, like blubber.
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inductive
C2
/ɪnˈdʌktɪv/
arising from inductance
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mutagenic
C2
/ˌmjuːtəˈdʒɛnɪk/
capable of causing genetic mutation, or relating to the production of mutations
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ratcatcher
C2
/ˈrætˌkætʃɚ/
a person employed to catch or destroy rats and other vermin
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tyrannous
C2
/ˈtɪɹənəs/
using authority in a cruel, oppressive, unjust, or arbitrary way; characteristic of a tyrant
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sociability
C2
/ˌsoʊ.ʃəˈbɪl.ə.ti/
the quality or disposition of enjoying and engaging readily in the company of others
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sacral
C2
/ˈsækɹəl/
relating to or situated near the sacrum at the base of the spine
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capacious
C2
/kəˈpeɪʃəs/
Having a lot of space inside; able to hold a great deal.
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protectress
C2
/prəˈtɛktrɪs/
a woman who protects, guards, or acts as a patron; now uncommon
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lacerate
C2
/ˈlæ.sɚ.ɛɪt/
irregularly slashed and jagged as if torn
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basaltic
C2
/bəˈsɑːl.tɪk/
geology: relating to, formed from, containing, or resembling basalt
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prescience
C2
/ˈpɹɛʃəns/
Knowledge of events before they take place.
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stigmatize
C2
/ˈstɪɡ.mə.taɪz/
to describe or treat a person or group as shameful, disgraceful, or socially unacceptable
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instrumentality
C2
/ˌɪnstrəmɛnˈtælɪti/
The condition or quality of being instrumental; being useful; serving a purpose.
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agglomeration
C2
/əˌglɑːmɝˈeɪʃən/
a mass or collection of different things gathered or clustered together
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revelling
C2
/ˈɹɛvəlɪŋ/
boisterous or festive celebration, especially with drinking; revelry
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unambitious
C2
/ˌʌnæmˈbɪʃəs/
having little desire for achievement, advancement, or honor
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stratification
C2
/ˌstrætəfɪˈkeɪʃən/
the formation, arrangement, or classification of something into distinct layers
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kinswoman
C2
/ˈkɪnzwʊmən/
a female relative; a woman belonging to the same family or kin group
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unperturbed
C2
/ˌənpɝˈtɝːbd/
free from emotional agitation or nervous tension
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formalism
C2
/ˈfɔrməˌlɪzəm/
strict adherence to prescribed forms, rules, or procedures, sometimes at the expense of substance
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hydrodynamic
C2
/ˌhaɪ.droʊ.daɪˈnæm.ɪk/
relating to the motion of liquids and the forces acting on bodies in moving liquids
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abutment
C2
/əˈbʌt.mn̩t/
a solid structure that supports the end or resists the outward thrust of a bridge, arch, dam, or similar construction
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irreducible
C2
/ˌɪɹɪˈdjuːsɪbəl/
incapable of being made smaller or simpler
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roundelay
C2
/ˈɹaʊndəˌleɪ/
a song in which a line or phrase is repeated as the refrain
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petrify
C2
/ˈpɛtrɪfaɪ/
to make someone so frightened that they cannot move or think clearly
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dietetic
C2
/ˌdaɪ.əˈtɛt.ɪk/
relating to diet, nutrition, or the regulation of food for health
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galvanism
C2
/ˈɡælvəˌnɪzəm/
electricity produced by chemical action, especially as understood in early electrical science
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iconoclastic
C2
/ˌaɪkənəˈklæstɪk/
Characterized by attack on established and accepted beliefs, customs, or institutions; of or pertaining to iconoclasm.
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impetuosity
C2
/ɪmˌpɛtʃuˈɑːsəti/
the quality of acting suddenly and forcefully without considering the consequences
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narrowness
C2
/ˈnɛroʊnəs/
a restriction of range or scope
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inextricable
C2
/ˌɪnɪkˈstrɪkəbəl/
so closely connected or entangled that separation is impossible
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flatcar
C2
/ˈflæt.kɑːr/
chiefly North American, a railroad freight car with a flat open deck and no permanent sides or roof, used for containers, vehicles, machinery, and other bulky loads
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illustrative
C2
/ɪˈlʌs.tɹə.tɪv/
Demonstrative, exemplative, showing an example or demonstrating.
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ptarmigan
C2
/ˈtɑːmɪɡən/
large Arctic and subarctic grouse with feathered feet and usually white winter plumage
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yeasty
C2
/ˈjiːsti/
containing yeast or having the smell or taste of yeast
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propulsive
C2
/prəˈpʌlsɪv/
tending to or capable of propelling
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disparagement
C2
The act of criticizing someone or something in a way that lowers their value; belittlement.
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tantalizingly
C2
/ˈtæntəˌlaɪzɪŋli/
In a way that tempts you with something desirable but just out of reach.
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starless
C2
/ˈstɑɹləs/
having no stars visible
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circumnavigation
C2
The act of travelling all the way around something, especially the world.
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bushranger
C2
/ˈbʊʃˌreɪn.dʒɚ/
historical Australian usage: an escaped convict or other outlaw who lived in the bush and survived by robbery
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convergent
C2
/kənˈvɝ.dʒənt/
tending to come together, meet, or become more alike from different directions
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edify
C2
/ˈɛdɪfaɪ/
To improve someone morally or intellectually through teaching.
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vestment
C2
/ˈvɛstmənt/
a ceremonial garment worn by a member of the clergy during worship
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empiricism
C2
/ɛmˈpɪrəˌsɪzəm/
A pursuit of knowledge purely through experience, especially by means of observation and sometimes by experimentation.
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recumbent
C2
Lying down, especially in a relaxed position.
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incautious
C2
/ɪnˈkɑʃəs/
not sufficiently cautious; acting or speaking without proper care
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unverifiable
C2
/ˌʌnˌvɛrəˈfaɪəbəl/
not capable of being checked, confirmed, or established as true by available evidence or method
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invective
C2
/ɪnˈvɛktɪv/
Something spoken or written, intended to cast shame, disgrace, censure, or reproach on another.
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legatee
C2
/ˌlɛɡəˈti/
law: a person or organization that receives a legacy under a will
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infernally
C2
Extremely; to an annoying degree.
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miscalculate
C2
/mɪsˈkælkjəleɪt/
to calculate a number, amount, distance, or other quantity incorrectly
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pragmatically
C2
/prægˈmætɪkəli/
in a realistic manner
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twiddly
C2
/ˈtwɪdəli/
informal: winding, twisting, or intricately shaped
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shilly-shally
C2
/ˈʃɪl.iˌʃæl.i/
to hesitate, waver, or waste time because one is unable or unwilling to make a decision
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unmodified
C2
not changed in form or character
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piggery
C2
/ˈpɪɡəri/
a place where pigs are kept or raised
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magnanimously
C2
/mæɡˈnænɪməsli/
In a generous and forgiving way, especially toward a rival.
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