leg·ume 
(lĕgym′, lə-gym)
(lĕgym′, lə-gym)n.
1. A plant of the pea family.
2.
a. A pod of such a plant, which splits into two valves with the seeds attached to one edge of the valves.
b. Such a pod or seed used as food. Peas, beans, and lentils are legumes.
[French légume, from Latin legūmen, bean.]