noun /lɪˈɡjuːm,ˈlɛɡjuːm/
a) The fruit or seed of leguminous plants (as peas or beans) used for food; a vegetable used for food.
b) Any of a large family (Leguminosae syn. Fabaceae) of dicotyledonous herbs, shrubs, and trees having fruits that are legumes or loments, bearing nodules on the roots that contain nitrogen-fixing bacteria, and including important food and forage plants (as peas, beans, or clovers).
Wikipedia foundation.