monogyny

from WordNet (r) 3.0 (2006)

monogyny
    n 1: having only one wife at a time

from The Collaborative International Dictionary of English v.0.48

Monogyny \Mo*nog"y*ny\, n. [See {Monogynia}.]
   1. Marriage with the one woman only.
      [1913 Webster]

   2. (Bot.) The state or condition of being monogynous.
      [1913 Webster]