What is "crotyl"

n. (context organic chemistry English) The univalent radical CH₃-CH=CH-CH₂-

A crotyl group is an organic functional group with the formula RCHCH=CHCH. Systematically, it is called a but-2-en-1-yl group and exhibits geometric isomerism, being either cis (Z) or trans (E). There are many simple compounds in which the crotyl group forms base carbon chain: crotyl alcohol, crotonaldehyde, crotonic acid, and crotyl acrylate are examples.