Definitions of legume:

• noun:   the seedpod of a leguminous plant (such as peas or beans or lentils)
• noun:   an erect or climbing bean or pea plant of the family Leguminosae
• noun:   the fruit or seed of any of various bean or pea plants consisting of a two-valved case that splits along both sides when ripe and having the seeds attached to one edge of the valves