molecule Meaning, Definition & Usage
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noun (physics and chemistry) the simplest structural unit of an element or compound
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noun (nontechnical usage) a tiny piece of anything
speck; particle; atom; corpuscle; mote.
WordNet
Mol"e*cule noun
Etymology
Dim. fr. L.Definitions
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One of the very small invisible particles of which all matter is supposed to consist. -
(Physics) The smallest part of any substance which possesses the characteristic properties and qualities of that substance, and which can exist alone in a free state. -
(Chem.) A group of atoms so united and combined by chemical affinity that they form a complete, integrated whole, being the smallest portion of any particular compound that can exist in a free state; as, a . Cf.molecule of water consists of two atoms of hydrogen and one of oxygenAtom .