Individual components of atoms, usually subatomic; subnuclear particles are usually detected only when the atomic nucleus decays and then only transiently, as most of them are unstable, often yielding pure energy without substance, i.e., radiation.

Synonyms: Particle, Elementary, Particles, Elementary, Particle, Fundamental, Baryon, Elementary Particles, Elementary Particle, Fundamental Particles, Particles, Fundamental, Baryons, Fundamental Particle