Cro*ton"ic (kr?-t?n"?k), a. Of or pertaining to, or derived from, a plant of the genus Croton, or from croton oil.

Crotonic acid(Chem.), a white crystalline organic acid, C₃H₅.CO₂H, of the ethylene, or acrylic acid series. It was so named because formerly supposed to exist in croton oil. Also, any acid metameric with crotonic acid proper.

&fist; The acid characteristic of croton oil is tiglic or tiglinic acid, a derivative of crotonic acid.