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3 definitions found

From Webster's Revised Unabridged Dictionary (1913) [web1913]:

  Atom \At"om\, v. t.
     To reduce to atoms. [Obs.] --Feltham.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:

  Atom \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
        molecule.
  
     3. Anything extremely small; a particle; a whit.
  
              There was not an atom of water.       --Sir J. Ross.

From WordNet (r) 2.0 [wn]:

  atom
       n 1: (physics and chemistry) the smallest component of an element
            having the chemical properties of the element
       2: (nontechnical usage) a tiny piece of anything [syn: {molecule},
           {particle}, {corpuscle}, {mote}, {speck}]

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