mad apple ma·dapple uncommon noun 1. hairy upright herb native to southeastern Asia but widely cultivated for its large glossy edible fruit commonly used as a vegetable Synonymseggplantauberginebrinjaleggplant bushgarden eggmad appleSolanum melongena 2. egg-shaped vegetable having a shiny skin typically dark purple but occasionally white or yellow Synonymseggplantauberginemad apple Related words Broader terms solanaceous vegetableherb Parts eggplantSolanum Part of eggplant WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.