The Collaborative International Dictionary of English v.0.48:
monovular \monovular\ adj. (Biol.) derived from a single egg or ovum; -- of twins; as, identical twins are monovular. Contrasted with fraternal. Syn: identical. [WordNet 1.5]WordNet (r) 3.0 (2006):
monovular adj 1: (of twins) derived from a single egg or ovum; "identical twins are monovular" [syn: identical, monovular] [ant: biovular, fraternal]