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2 definitions found
 for Atom
From The Collaborative International Dictionary of English v.0.48 :

  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.
            [1913 Webster]
  
     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.
           [1913 Webster]
  
     2. (Chem.) The smallest particle of matter that can enter
        into combination; one of the elementary constituents of a
        molecule.
        [1913 Webster]
  
     3. Anything extremely small; a particle; a whit.
        [1913 Webster]
  
              There was not an atom of water.       --Sir J. Ross.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Atom \At"om\, v. t.
     To reduce to atoms. [Obs.] --Feltham.
     [1913 Webster] Atom bomb

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