a pale yellow, water-insoluble, liquid aldehyde, C 10 H 16 O, having a strong lemonlike odor, consisting in natural form of two isomers (citral a or geranial and citral b or neral) usually obtained from the oils of lemon and orange or synthetically: used chiefly in perfumery, flavoring, and the synthesis of vitamin A.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a fool or simpleton; ninny.
a scrap or morsel of food left at a meal.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a yellow volatile liquid with a lemon-like odour, found in oils of lemon grass, orange, and lemon and used in perfumery: a terpene aldehyde consisting of the cis- isomer (citral-a or geranial) and the trans- isomer (citral-b or neral). Formula: (CH3)2C:CH(CH2)2C(CH3):CHCHO