/ˈmɛs.ɒn/
OriginFrom Ancient Greek μέσον (méson, “middle”). Doublet of medium.
- regionalThe mesial plane dividing the body into similar right and left halves.
- obsoleteA member of a group of subatomic particles having a mass intermediate between electrons and protons. (The most easily detected mesons fit this definition.)
- particle, specificallyAn elementary particle that is composed of a quark and an antiquark, such as a kaon or pion. (Mesons composed of rarer quarks are much heavier.)
Formsmesons(plural)