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• dalton
  dalton

  noun

  atomic mass unit.
• Dalton
  Dalton

  noun

  John, 1766–1844, English chemist and physicist.

dalton

¹ American  

[dawl-tn] / ˈdɔl tn /

noun

Physics.

1. atomic mass unit.

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Dalton ² American  

[dawl-tn] / ˈdɔl tn /

noun

1. John, 1766–1844, English chemist and physicist.

2. Robert, 1867–92, U.S. outlaw in the West.

3. a city in NW Georgia.

4. a male given name.

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Dalton ¹ British  

/ ˈdɔːltən /

noun

1. John. 1766–1844, English chemist and physicist, who formulated the modern form of the atomic theory and the law of partial pressures for gases. He also gave the first accurate description of colour blindness, from which he suffered

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dalton ² British  

/ ˈdɔːltən /

noun

1. another name for atomic mass unit

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Dalton ¹ Scientific  

1. British chemist whose pioneering work on the properties of the atmosphere and gases led him to formulate the atomic theory. Dalton's theory stipulates that all matter is made up of combinations of atoms, the atoms of each element being identical. These atoms can be neither created nor destroyed, but chemical reactions take place through their rearrangement.

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dalton ² Scientific  

/ dôl′tən /

1. See atomic mass unit

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Etymology

Origin of dalton

First recorded in 1935–40; named after J. Dalton

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Example Sentences

See Examples For:

dalton Dalton

One dalton is defined as one-twelfth the mass of a carbon-12 atom.

From Science Daily ● Oct. 22, 2026

Matt Damon said Devyn Dalton, his stunt double in ‘The Odyssey,’ has ‘the greatest arms’ he’s ever seen.

From Los Angeles Times ● Nov. 6, 2026

Backup catcher Dalton Rushing underwent elbow surgery last week.

From Los Angeles Times ● Oct. 30, 2026

As for Dalton, he says he’s “90% sure” he’ll keep the Duo.

From The Wall Street Journal ● Oct. 27, 2026

Britain's Dalton Smith defended his WBC light-welterweight world title with a split-decision victory over Alberto Puello in a triumphant homecoming in Sheffield.

From BBC ● Oct. 24, 2026

Someone cleared her throat, and I looked over to see that it was Mrs. Dalton.

From "The Lions of Little Rock" by Kristin Levine

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