• WordNet 3.6
    • adj polygynous having more than one wife at a time
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Webster's Revised Unabridged Dictionary
    • a Polygynous (Bot) Having many styles; belonging to the order Polygynia.
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Century Dictionary and Cyclopedia
    • polygynous In botany, having many styles; belonging to the order Polygynia.
    • polygynous Polygamous, as a male; having more than one female as wife or mate.
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In literature:

The normal man is instinctively more polygynous than the normal woman is polyandrous.
"The Sexual Question" by August Forel
They are polygynous, but, unlike the Arabs, great independence is granted their women.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 5" by Various

In news:

The historian Walter Scheidel describes this Greco-Roman practice as polygynous monogamy —a kind of halfsy moral stance on promiscuity.