Mad-apple \Mad"-ap`ple\, Mad apple \Mad" ap`ple\, n.
1. (Bot.) The eggplant bush ({Solanum melongena}). See
{Eggplant}.
Syn: eggplant, aubergine, brinjal, eggplant bush, garden egg,
{Solanum melongena}.
[1913 Webster + WordNet 1.5]
2. 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.
[WordNet 1.5]