mung Syllabification: (mung)Pronunciation: /məNG/ (also mung bean)Definition of mung noun 1a small round green bean. 2the tropical Old World plant that yields the mung bean, commonly grown as a source of bean sprouts. Vigna radiata (or Phaseolus aureus), family Leguminosae Origin: early 19th century: from Hindi mūngmung in other Oxford dictionaries Definition of mung in the British & World English dictionary