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  1.6  [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},  {mote},  {speck}] 

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