- 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:
--1 has particulars:elementary particle, fundamental particle, subatomic particle; nucleus isotope; monad; carbon atom; hydrogen atom; free radical, radical Derived forms: verb atomize3, verb atomise1, verb atomise3 - 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; flyspeckDerived form: verb atomise3