Subatomic-particle definition

sŭbə-tŏmĭk
Any of various particles of matter smaller than a hydrogen atom, including the elementary particles and hadrons.
noun
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Any of various particles of matter that are smaller than a hydrogen atom. Protons, neutrons, and electrons are subatomic particles, as are all hadrons and leptons.
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Any of many units of matter smaller than an atom.
noun
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Other Word Forms

Noun

Singular:
subatomic-particle
Plural:
subatomic-particles