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(chemistry, physics) The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.

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atom

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atom

/ˈætəm/

noun

(chemistry, physics) The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.

The atom is the basic unit of matter.

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意味（1）

(chemistry, physics) The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.

Meronyms: proton, neutron, electron

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意味（2）

(history of science) A hypothetical particle posited by Greek philosophers as an ultimate and indivisible component of matter.

意味（3）

(now generally regarded figuratively) The smallest, indivisible constituent part or unit of something.

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意味（4）

(philosophy) In logical atomism, a fundamental fact that cannot be further broken down.

意味（5）

(historical) The smallest medieval unit of time, equal to fifteen ninety-fourths of a second.

意味（6）

A mote of dust in a sunbeam.

意味（7）

A very small amount; a whit.

"Doctor, tell me one word more," said Theodore, quivering with suppressed emotion. "How do you think it will end?" / "I have hardly the faintest atom of hope," answered this honest, earnest man.

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