Allylic

a. Chem. [f. ALLYL + -IC.] Of or belonging to allyl.

1863.  Watts, Dict. Chem., I. 141. Allylic aldehyde (acrolein).

1873.  Williamson, Chem., § 290. Allylic sulphide (C₃H₅)₂S,… found to be identical with the essential oil of garlic.