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Meaning of ATOM

Pronunciation:  'atum

WordNet Dictionary
  1. [n]  (nontechnical usage) a tiny piece of anything
  2. [n]  (physics and chemistry) the smallest component of an element having the chemical properties of the element

ATOM is a 4 letter word that starts with A.


 Synonyms: molecule, mote, particle, speck
 See Also: carbon atom, chemical element, chylomicron, element, elementary particle, free radical, fundamental particle, grain, hydrogen atom, isotope, material, matter, monad, nucleus, radical, stuff, subatomic particle, substance



Webster's 1913 Dictionary
  1. \At"om\, n. [L. atomus, Gr. ?, uncut, indivisible; 'a priv.
    + ?, verbal adj. of ? to cut: cf. F. atome. See {Tome}.]
    1. (Physics)
       (a) An ultimate indivisible particle of matter.
       (b) An ultimate particle of matter not necessarily
           indivisible; a molecule.
       (c) A constituent particle of matter, or a molecule
           supposed to be made up of subordinate particles.
    Note: These three definitions correspond to different views
          of the nature of the ultimate particles of matter. In
          the case of the last two, the particles are more
          correctly called molecules. --Dana.
    2. (Chem.) The smallest particle of matter that can enter
       into combination; one of the elementary constituents of a
    3. Anything extremely small; a particle; a whit.
             There was not an atom of water.       --Sir J. Ross.
  2. \At"om\, v. t.
    To reduce to atoms. [Obs.] --Feltham.
Biology Dictionary
 Definition: This is the tiniest particle of matter that retains the chemical properties of an element; atoms are typically composed of neutral subatomic particles (neutrons), positively-charged particles (protons) and negatively-charged particles (electrons).
 Definition: a building block of matter.
Thesaurus Terms
 Related Terms: ace, acid, acidity, agent, air, alkali, alkalinity, alloisomer, anion, antacid, atomic model, atomic particles, atoms, base, biochemical, bit, Bohr atom, brute matter, building block, cation, chemical, chemical element, chromoisomer, component, compound, constituent, copolymer, cubical atom, dab, dash, dimer, Dirac atom, 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, I, inorganic chemical, ion, iota, isobar, isomer, isotopic isobar, jot, labeled atom, Lewis-Langmuir 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, Thomson atom, tincture, tinge, tiny bit, tittle, touch, trace, tracer, tracer atom, triad, trifling amount, trimer, trivia, unit, unit of being, valence shell, water, whit