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The Collaborative International Dictionary
Butyryl

Butyryl \Bu"ty*ryl\, n. [Butyric + -yl.] (Chem.) The radical ( C3H7.CO-) of butyric acid.

Wiktionary
butyryl

n. (context organic chemistry especially in combination English) The univalent radical C3H7COO- derived from butyric acid