WordReference Random House Unabridged Dictionary of American English © 2026
an•ti•pro•ton
(an′tē prō′ton, an′tī-),USA pronunciation n. [Physics.]
- Physicsan elementary particle having negative charge equal in magnitude to that of the electron and having the same mass and spin as a proton;
the antiparticle of the proton.
- anti- + proton 1935–40
'antiproton' also found in these entries (note: many are not synonyms or translations):