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at·om

atom

 
pronunciation:
ae tm
features:
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part of speech: noun
definition 1: the smallest possible unit of a chemical element. The major parts of atoms contain protons, neutrons, and electrons. They are the basis of all matter in the universe.
definition 2: anything extremely small; tiny bit.
There was not an atom of food in the house after they left.
similar words:
particle
Word History
Atom is from an ancient Greek word that means "not able to be cut or divided."
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  chemistry, physics
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