# methylidene

> English word · Noun

## Definitions
1. The CH₂= group in which the free valences are part of a double bond.

## Etymology
May comes from methyl + -ide + -ene.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/methylidene