noun
Freq #182284
Meanings
-
1
noun
the antiparticle of the proton, with the same mass but a negative electric charge
A proton and an antiproton can annihilate when brought together.
Thesaurus
Synonyms
1
noun
· the antiparticle of the...
negative protonp-bar
Word family
Forms
antiprotonsproton-antiproton
Etymology
Formed from anti- + proton. The first antiprotons were produced experimentally in 1955; the prefix identifies the proton's oppositely charged antimatter counterpart.