isomer.
Any of two or more compounds with the same molecular formula but with different structure.
Meaning & usage
Any of two or more compounds with the same molecular formula but with different structure.
Any of two or more atomic nuclei with the same mass number and atomic number but with different radioactive properties.
Where this word comes from
From iso- + -mer.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.