Vigna sinensis vig·na·si·nensis uncommon noun 1. sprawling Old World annual cultivated especially in southern United States for food and forage and green manure Synonymscowpeacowpea plantblack-eyed peaVigna unguiculataVigna sinensis Related words Broader terms legume Parts Vigna Part of black-eyed peacowpea WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.