Webster's English Dictionary

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molecule

mol.e.cule \'ma:l-i-.kyu:(*)l\ n [F mole`cule, fr. NL molecula, dim. of L 
   moles mass] 1a: the smallest particle of an element or compound capable of 
   retaining ch emical identity with the substance in mass 1b: a quantity 
   proportional to the molecular weight; esp : GRAM  MOLECULE 2: a tiny bit : 
   PARTICLE