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vinylidene group

or vinylidene radical

[vahy-nil-i-deen groop or vahy-nil-i-deen rad-i-kuh l] /vaɪˈnɪl ɪˌdin ˌgrup or vaɪˈnɪl ɪˌdin ˌræd ɪ kəl/
noun, Chemistry.
the bivalent group C 2 H 2 , derived from ethylene.
Origin of vinylidene group
vinyl + -id3 + -ene Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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