baryon
Technical term in particle physics for a subatomic particle made of three quarks, such as protons and neutrons.
Protons and neutrons are types of baryons.
Lepton, a class of elementary particles that includes electrons and neutrinos, distinct from baryons.
From 重 (heavy) + 粒子 (particle), a calque of English 'baryon' (from Greek 'barys' meaning heavy).