The Collaborative International Dictionary of English v.0.48:

Monecian \Mo*ne"cian\, Monecious \Mo*ne"cious\, a. (Bot.)
   See Monoecian, and Monoecious.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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