[leg-yoom, li-gyoom]
any plant of the legume family, especially those used for feed, food, or as a soil-improving crop.
the pod or seed vessel of such a plant.
any table vegetable of the legume family.

1670–80; < French légume vegetable < Latin legūmen pulse, a leguminous plant, derivative of legere to gather

nonlegume, noun
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World English Dictionary
legume (ˈlɛɡjuːm, lɪˈɡjuːm)
1.  the long dry dehiscent fruit produced by leguminous plants; a pod
2.  any table vegetable of the family Fabaceae (formerly Leguminosae), esp beans or peas
3.  any leguminous plant
[C17: from French légume, from Latin legūmen bean, from legere to pick (a crop)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"plant of the group of the pulse family," 1670s, from Fr. légume, from L. legumen, of unknown origin. One suggestion ties it to L. legere "to gather" (see lecture), because they can be scooped by the handful. Used in M.E. in the L. form legumen (late 14c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
legume   (lěg'ym', lə-gym')  Pronunciation Key 
  1. Any of a large number of eudicot plants belonging to the family Leguminosae (or Fabaceae). Their characteristic fruit is a seed pod. Legumes live in a symbiotic relationship with bacteria in structures called nodules on their roots. These bacteria are able to take nitrogen from the air, which is in a form that plants cannot use, and convert it into compounds that the plants can use. Many legumes are widely cultivated for food, as fodder for livestock, and as a means of improving the nitrogen content of soils. Beans, peas, clover, alfalfa, locust trees, and acacia trees are all legumes.

  2. The seed pod of such a plant.

leguminous adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
By the holiday the seeds or legumes will have shoots several inches long,
  providing a powerful symbol of rebirth.
Legumes that are harvested for their dry seeds, such as beans or lentils, are
  called pulses.
Not food products made from heavily processed and refined grains and legumes
  that our ancient ancestors didn't eat.
For many diners who enjoy beans, the side effects can be somewhat
  unpleasant--the legumes are notorious for causing flatulence.
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