polygynyPronunciation: /pəˈlɪdʒɪni/Definition of polygyny noun [mass noun] polygamy in which a man has more than one wife. Compare with polyandry. Zoology a pattern of mating in which a male animal has more than one female mate. Derivatives polygynousPronunciation: /pəˈlɪdʒɪnəs/ adjective Origin: late 18th century: from poly- 'many' + Greek gunē 'woman'polygyny in other Oxford dictionaries Definition of polygyny in the US English dictionary