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Word of the Day Tuesday, June 9, 2026

isomer

/ˈaɪsəmər/ noun · British & US
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What does isomer mean?

noun

A molecule with the same molecular formula as another molecule, but with a different structural formula. Isomers can have the same number and types of atoms, but differ in the arrangement of their atoms.

Example

"The two molecules, butane and isobutane, are isomers because they have the same molecular formula (C4H10) but differ in their structural formulas."

Definition generated by AI and curated by RJS Tech Solutions LLP.

Synonyms for isomer

Rhymes with isomer

Etymologically related