'Polygamist' definitions:

Definition of 'polygamist'

(from WordNet)
noun
Someone who is married to two or more people at the same time

Definition of 'Polygamist'

From: GCIDE
  • Polygamist \Po*lyg"a*mist\, n. [Cf. F. polygamiste, polygame, Gr. ?, a.] One who practices polygamy, or maintains its lawfulness. [1913 Webster]