Colocynth, a trailing or climbing plant of the gourd family. It is grown in Africa, Asia, and Europe's Mediterranean countries. The colocynth is also known as bitter apple, bitter gourd, and bitter cucumber. The plant bears a single globe-shaped yellow fruit about the size of an orange. The rind is smooth and thin. The dried pulp of the fruit is used in medicine as a purgative.

The colocynth is Citrullus colocynthis of the gourd family, Cucurbitaceae.