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Noun molecule has 2 senses
  1. molecule - (physics and chemistry) the simplest structural unit of an element or compound
    --1 is a kind of
    unit, building block
    --1 has parts:
     chain, chemical chain; atom; group, radical, chemical group
    --1 has particulars:
     dipole molecule; protein molecule; coenzyme; macromolecule, supermolecule
  2. atom, molecule, particle, corpuscle, mote, speck - (nontechnical usage) a tiny piece of anything
    --2 is a kind of material, stuff
    --2 has particulars: grain; chylomicron; flyspeck
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