Webster's Revised Unabridged Dictionary · 1913

eggplant

eggplant , noun

1.
(Botany) A plant (Solanum Melongena), of East Indian origin, allied to the tomato, and bearing a large, glossy, edible fruit, shaped somewhat like an egg; mad-apple. It is widely cultivated for its fruit, commonly eaten as a vegetable.
2.
The fruit of the eggplant.

Also: egg-plant