1either of two cultivated varieties of bean plant having small black seeds.
- a variety of soybean, used fermented in Asian cooking. a Mexican variety of string bean.
the dried seed of the black bean plants, used as a vegetable. 2either of two Australian plants of the pea family.
- a large tree with red or yellow flowers, dark beanlike seeds, and a hard and decorative wood (Castanospermum australe, family Leguminosae). a liana with blackish flowers (Kennedia nigricans, family Leguminosae).