The Collaborative International Dictionary of English v.0.48:

Monoicous \Mo*noi"cous\, a. (Bot.)
   Monoecious.
   [1913 Webster]

WordNet (r) 3.0 (2006):

monoicous
    adj 1: having male and female reproductive organs in the same
           plant or animal [syn: monoecious, monecious,
           monoicous] [ant: dioecian, dioecious]