Pronunciation: (lem'un),[key] —n. 1. the yellowish, acid fruit of a subtropical citrus tree, Citrus limon. 2. the tree itself.
3. See lemon yellow. 4. Informal.a person or thing that proves to be defective, imperfect, or unsatisfactory; dud: His car turned out to be a lemon.
—adj. 1. made of or with lemon.
2. having the color, taste, or odor of lemon.