The Collaborative International Dictionary
Mad-apple
Mad-apple \Mad"-ap`ple\, Mad apple \Mad" ap`ple\, n.
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(Bot.) The eggplant bush ( Solanum melongena). See Eggplant.
Syn: eggplant, aubergine, brinjal, eggplant bush, garden egg, Solanum melongena.
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The fruit of the eggplant bush, a large egg-shaped vegetable having a shiny skin typically dark purple but occasionally white or yellow.
Syn: eggplant, aubergine.
Wiktionary
mad-apple
n. (context botany obsolete English) eggplant