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Synonyms
mol·e·cule (mŏĺĭ-kyōōĺ)

[French molécule, from New Latin mōlēcula, diminutive of Latin mōlēs, mass.]

noun 

  1. The smallest particle of a substance that retains the chemical and physical properties of the substance and is composed of two or more atoms; a group of like or different atoms held together by chemical forces.
  2. A small particle; a tiny bit.