Mad-apple
Mad´-ap`ple
n. 1. (Bot.) The eggplant bush (Solanum melongena). See Eggplant.
2. The fruit of the eggplant bush, a large egg-shaped vegetable having a shiny skin typically dark purple but occasionally white or yellow.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.