po·lyg·a·my 
(pə-lĭgə-mē)
(pə-lĭgə-mē)n.
1. The condition or practice of having more than one spouse at one time.
2. Zoology A mating pattern in which a single individual mates with more than one individual of the opposite sex.
[French polygamie, from Late Latin polygamia, from Greek polugamiā : polu-, poly- + -gamiā, -gamy.]
- extravagate
- extravasate
- extravasation
- extravascular
- extravehicular activity
- extraversion
- extraversion
- extravert
- extravert
- extraverted
- extraverted
- extra-virgin olive oil
- extremal
- extreme
- extremely
- extremely high frequency
- extremely low frequency
- extremeness
- extreme unction
- extremism
- extremist
- extremity
- extremophile
- extremum
- extricable