Kalmar "allylic" tana nufin rukunin aiki na sinadarai ko tsarin tsarin kwayoyin halitta wanda ya ƙunshi ƙungiyar allyl. Ƙungiya ta allyl sarkar carbon ce guda uku tare da haɗin gwiwa biyu tsakanin tsakiya da ƙarshen carbons, da kuma haɗin gwiwa guda ɗaya tsakanin sauran carbons guda biyu. A cikin sinadarai na halitta, ana amfani da kalmar "allylic" don kwatanta zarra na carbon da ke kusa da, ko kusa da, ƙungiyar allyl. Kasancewar ƙungiyar abokantaka na iya yin tasiri ga sake kunnawa da kaddarorin kwayoyin halitta.