Noun
(medieval mythology) A gigantic tree supposed to have grown on the site of the destroyed cities Sodom and Gomorrah (see Genesis 18–19 in the Bible), the apples of which would turn to ash and smoke once picked.
(medieval mythology) The fruit of the mythical tree.
(botany) The names of various plants, often bearing bitter or poisonous fruit.
The mudar (Calotropis procera), a flowering plant, found from northern Africa to southeast Asia, which bears poisonous fruit.
The bitter apple, colocynth, etc. (Citrullus colocynthis), a desert plant native to Asia and the Mediterranean Basin with extremely bitter flesh.
A number of plants of the genus Solanum, the nightshades.
The forest bitterberry (Solanum anguivi), a plant native to non-arid parts of Africa.
The Carolina horsenettle (Solanum carolinense), a plant native to North America.
The bitter apple, bitterball, or bitter tomato (Solanum incanum), a plant native to sub-Saharan Africa, the Middle East, and India.
The black spine nightshade or devil's apple (Solanum linnaeanum), a plant native to southern Africa that bears poisonous berries.
The nipplefruit (Solanum mammosum), a plant native to South America.
Source: en.wiktionary.org