methylene.
The divalent group –CH₂– in which the free valencies are part of single bonds.
Meaning & usage
The divalent group –CH₂– in which the free valencies are part of single bonds.
The same group, present as a repeating unit, in aliphatic compounds with names such as hexamethylenediamine.
The unstable carbene :CH₂
Where this word comes from
French méthylène, from Ancient Greek μέθυ (méthu, “wine”) + ὕλη (húlē, “wood”). By surface analysis, meth- + -ylene.
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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.