The Collaborative International Dictionary of English v.0.48:

Monoecian \Mo*noe"cian\, a.
   1. (Bot.) Of or pertaining to the Monoecia; monoecious. -- n.
      One of the Monoecia.
      [1913 Webster]

   2. (Zool.) A monoecious animal, as certain mollusks.
      [1913 Webster]