common beet com·mon·beet uncommon noun 1. biennial Eurasian plant usually having a swollen edible root; widely cultivated as a food crop Synonymsbeetcommon beetBeta vulgaris Related words Broader terms vegetable Narrower terms beetrootchardmangel-wurzelsugar beet Parts Beta WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.