atom

I

(New American Roget's College Thesaurus)

n. particle, iota, speck. See littleness, power.

II

(Roget's IV) n.

1. [Tiny particle]

Syn. fragment, mite, speck, particle, iota, mote, jot, grain, scintilla; see also bit 1 .

2. [Particle in atomic physics]

Syn. the smallest particle of an element, molecule*, smallest quantity of a radical, basic unit, basic constituent, irreducible unit, irreducible constituent, atomic mass unit.

Parts and forms of atoms include: electron, proton, neutron, positron, neutrino, positive electron, neutral electron, nuclide quark; see also atomic energy , element 2 .

III

(Roget's 3 Superthesaurus) n.

particle, jot, bit, iota, scintilla, shred, bit. ''A specter threatening us with annihilation.''—Max Born. see science