chemistry An atom having a valence of one.
A singular metaphysical entity from which material properties are said to derive.
biology A single-celled microorganism (especially a flagellate protozoan).
Moby thesaurus: I, ace, air, an existence, atom, atomic particles, being, body, brute matter, building block, chemical element, component, constituent, creature, critter, earth, electron, element, elementary particle, elementary unit ... show more.
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