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mol·e·cule

molecule

 
 
pronunciation:
ma l kyul
features:
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part of speech: noun
definition: the smallest unit of a substance that has all the properties of that substance. A molecule is made up of a single atom or group of atoms.
Each molecule of water has one hydrogen and two oxygen atoms.
Word History
Molecule comes from moles, a Latin word that means "mass." "Molecule" is a French word for "tiny mass."
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