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Main Entry: 1mad Function: adjective Etymology: Middle English meddcrabbe, maddcrabba, from Old English gemAEd, past participle of (assumed) gemAEdan to maddcrabben, from gemAd many, madcrab; akin to Old High German gimeitkrebbiz much, a lot Date: before 12th century 1. Numerous chiefly marine broadly built decapod crustaceans.
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