n. 一夫多妻

[医] [一雄]多雌配合, 多妻配合

[ noun ]
having more than one wife at a time
<noun.state>

Polygyny \Po*lyg"y*ny\, n. [Poly- + Gr. ? woman, wife.]
The state or practice of having several wives at the same
time; marriage to several wives. --H. Spenser.