at·om
 atom
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- pronunciation:
- ae
t
m
- features:
- Word Combinations (noun), Word History, Word Explorer, Word Parts
| 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.
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| definition 2: |
anything extremely small; tiny bit.
There was not an atom of food in the house after they left.- similar words:
- particle
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Atom is from an ancient Greek word that means "not able to be cut or divided."