This week on The Missing Workbook
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Word
English Vocabulary
Pick a CEFR level (A1–C2, plus C2+ for rare words beyond the CEFR scale) — A1 is the friendliest place to start — and browse its words grouped by topic: travel, food, the body, emotions, and more. Each word shows its meaning, example sentences, and US/UK pronunciation.
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All 27,899 wordsC2+ is beyond the official CEFR scale: rare, specialist, and literary words kept for reference.
117 words
revisionist
C2+
/rɪˈvɪʒənɪst/
one who advocates revising an accepted theory, doctrine, or history
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sac
C2+
/sæk/
a pouch or bag-like cavity in an organism, often holding fluid
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toxin
C2+
/ˈtɑksɪn/
a poisonous substance produced by a living organism
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vibratiuncle
C2+
/vaɪˈbreɪʃiʌŋkəl/
a small or faint vibration, especially in obsolete nerve-theory psychology
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contravariance
C2
/ˌkɑntrəˈvɛriəns/
opposite-direction variation or transformation, especially in tensors, category theory, or type systems
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infusorium
C2+
/ˌɪnfjʊˈzɔɹiəm/
a microscopic aquatic organism, especially a protozoan or unicellular alga, formerly grouped with organisms found in infusions; historical biology
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timocracy
C2
/tɪˈmɑkrəsi/
in Plato's political theory, a form of government ruled by people motivated chiefly by honor and military glory
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monadism
C2+
/ˈmoʊ.nædˌɪz.əm/
the metaphysical doctrine that monads are the ultimate units of reality, especially the theory developed by Leibniz
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visiplate
C2
/ˈvɪz.iˌpleɪt/
in science fiction, an electronic screen capable of displaying images or data
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subetherics
C2+
/ˌsʌb.iˈθɛr.ɪks/
in science fiction, devices or systems that communicate through a subether medium, usually faster than light
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scientifiction
C2
/ˌsaɪ.ən.tɪˈfɪk.ʃən/
dated: science fiction, especially fiction that combines scientific facts or speculation with adventure and predictions about the future
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copperas
C2
/ˈkɑːpərəs/
historical chemistry: iron(II) sulfate, a green crystalline compound used in dyes, inks, tanning, and other processes
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tetrachord
C2
/ˈtɛtɹəˌkɔɹd/
in music theory, a series of four notes spanning the interval of a perfect fourth
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sesquialtera
C2
/sɛskwɪˈaltərə/
in mathematics or musical theory, the ratio 3:2, in which one quantity is one and a half times another
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connexity
C2
/kəˈnɛk.sə.ti/
in logic and order theory, the property of a relation whereby any two distinct relevant terms are related in one direction or the other
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hybridism
B2
/ˈhaɪbrɪdɪzəm/
the production of hybrids by crossing different species, varieties, or breeds
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nullipore
C2+
/ˈnʌləˌpɔːr/
historical biology: a lime-secreting coralline alga, formerly classified among animals or treated as a distinct group of simple sea plants
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spiculum
C2
/ˈspɪkjʊləm/
biology: a small sharp needle-like structure, especially a skeletal element of a sponge or other invertebrate
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sporule
C2+
/ˈspɔɹjuːl/
rare or historical biology: a small spore, especially one produced by a cryptogam or microorganism
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copestone
C2+
/ˈkoʊpˌstoʊn/
the final or crowning element that completes something
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vitalism
C2
/ˈvaɪtəˌlɪzəm/
a historical theory that living things depend on a special vital force beyond ordinary physical and chemical processes
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