The Collaborative International Dictionary of English v.0.48:
biovular \biovular\ adj. derived from two separate ferilized ova; -- of twins; as, fraternal twins are biovular. Antonym of identical. Syn: fraternal. [WordNet 1.5]WordNet (r) 3.0 (2006):
biovular adj 1: (of twins) derived from two separate fertilized ova; "fraternal twins are biovular" [syn: fraternal, biovular] [ant: identical, monovular]