mung bean

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An Asian plant (Vigna radiata) in the pea family, widely cultivated for its edible seeds and pods. It is the chief source of bean sprouts.
• noun A seed or pod of this plant.

from the GNU version of the Collaborative International Dictionary of English.

• noun The mung (Vigna radiata).
• noun The bean produced by the mung.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun the seed of Vigna radiata which is native to Bangladesh, India, and Pakistan

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun erect bushy annual widely cultivated in warm regions of India and Indonesia and United States for forage and especially its edible seeds; chief source of bean sprouts used in Chinese cookery; sometimes placed in genus Phaseolus