(nuclear physics) A subatomic particle that is not an elementary particle, i.e. a hadron or an atomic nucleus.

beta particle

A hyperon of short life.

(physics) Any particle, especially a subatomic particle, that carries an electric charge. / (chemistry) An ion.

(grammar) A preposition found in names, indicating nobility.

A particle with diameter less than about 100 nanometers (nm).

(physics) Any of a number of bound states of a heavy quark and its antiquark, especially that formed from a bottom quark and an anti-bottom quark.

(dated) atomic theory

(physics) The study of the motion of individual particles.

(physics) The sum of a particle's potential energy and kinetic energy