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The Collaborative International Dictionary
Vanillyl

Vanillyl \Va*nil"lyl\, n. [Vanillic + -yl.] (Chem.) The hypothetical radical characteristic of vanillic alcohol.

Wiktionary
vanillyl

alt. (context organic compound English) A functional group that characterizes the vanilloids. n. (context organic compound English) A functional group that characterizes the vanilloids.

Wikipedia