The Collaborative International Dictionary of English v.0.48:

Monoecious \Mo*noe"cious\, a. (Biol.)
   Having the sexes united in one individual, as when male and
   female flowers grow upon the same individual plant;
   hermaphrodite; -- opposed to dioecious.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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