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Noun atom has 2 senses
  1. atom - (physics and chemistry) the smallest component of an element having the chemical properties of the element
    --1 is a kind of
    substance, matter
    --1 is a part of chemical element, element; molecule
    --1 has parts:
     elementary particle, fundamental particle, subatomic particle; nucleus
    --1 has particulars:
     isotope; monad; carbon atom; hydrogen atom; free radical, radical
    Derived forms: verb atomize3, verb atomise1, verb atomise3
  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
    Derived form: verb atomise3
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