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The Collaborative International Dictionary
Styryl

Styryl \Sty"ryl\, n. [Styrax + -yl.] (Chem.) A hypothetical radical found in certain derivatives of styrolene and cinnamic acid; -- called also cinnyl, or cinnamyl.

Wiktionary
styryl

n. (context organic chemistry English) The univalent radical C6H5-CH=CH- derived from styrene