spinach beet spi·nach·beet uncommon noun 1. beet lacking swollen root; grown as a vegetable for its edible leaves and stalks SynonymschardSwiss chardspinach beetleaf beetchard plantBeta vulgaris cicla 2. long succulent whitish stalks with large green leaves SynonymschardSwiss chardspinach beetleaf beet Related words Broader terms greensbeet Parts chard Part of chard WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.