Atom

n.	1.	(Physics) An ultimate indivisible particle of matter.
	2.	(Chem.) The smallest particle of matter that can enter into combination; one of the elementary constituents of a molecule.
	3.	Anything extremely small; a particle; a whit. There was not an atom of water. - Sir J. Ross.
v. t.	1.	To reduce to atoms.

Noun	1.	atom - (physics and chemistry) the smallest component of an element having the chemical properties of the element
	2.	atom - (nontechnical usage) a tiny piece of anything Synonyms: corpuscle, mote, particle, speck, molecule

Bohr atom, Dirac atom, I, Lewis-Langmuir atom, Thomson atom, ace, acid, acidity, agent, air, alkali, alkalinity, alloisomer, anion, antacid, atomic model, atomic particles, atoms, base, biochemical, bit, brute matter, building block, cation, chemical, chemical element, chromoisomer, component, compound, constituent, copolymer, cubical atom, dab, dash, dimer, dole, dot, dram, dribble, driblet, dwarf, dyad, earth, electron, element, elementary particle, elementary unit, fabric, farthing, fire, fleck, flyspeck, fragment, fundamental particle, gobbet, grain, granule, groat, hair, handful, heavy chemicals, heptad, hexad, high polymer, homopolymer, hydracid, hyle, hypostasis, inorganic chemical, ion, iota, isobar, isomer, isotopic isobar, jot, labeled atom, little, little bit, lota, macromolecule, material, material world, materiality, matter, medium, meson, metamer, minim, minimum, minutiae, mite, modicum, molecule, monad, monomer, mote, natural world, nature, neutral atom, neutralizer, no other, nonacid, none else, normal atom, nothing else, nought beside, nuclear atom, nuclear isomer, nuclear particle, nuclide, nutshell, octad, one, one and only, organic chemical, ounce, oxyacid, particle, pebble, pentad, physical world, pinch, pittance, planetary shell, plenum, point, polymer, proton, pseudoisomer, quark, radiation atom, radical, reagent, recoil atom, scruple, shade, shell, smack, smidgen, smitch, soupcon, speck, spice, spoonful, spot, stripped atom, stuff, subshell, substance, substratum, suggestion, sulfacid, suspicion, tagged atom, tangible, tetrad, the four elements, thimbleful, tincture, tinge, tiny bit, tittle, touch, trace, tracer, tracer atom, triad, trifling amount, trimer, trivia, unit, unit of being, valence shell, water, whit