https://doi.org/10.1351/goldbook.A00245
The group $\ce{CH2=CHCH2}$ (allyl) and derivatives formed by substitution. The term 'allylic position' or 'allylic site' refers to the saturated carbon atom. A group, such as $\ce{–OH}$, attached at an allylic site is sometimes described as 'allylic'.