noun
antimatter
Physics term for matter composed of antiparticles. Used in scientific contexts.
反物質は通常の物質と接触すると対消滅を起こす。
Antimatter annihilates upon contact with ordinary matter.
Refers to ordinary matter, as opposed to antimatter.
Compound of 反 (anti-) and 物質 (matter), a calque of English 'antimatter'.