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