The Collaborative International Dictionary
Biparous
Biparous \Bip"a*rous\, a. [L. bis twice + parere to bring forth.] Bringing forth two at a birth.
Douglas Harper's Etymology Dictionary
Wiktionary
biparous
a. producing two offspring from one pregnancy; twinning
WordNet
biparous
adj. producing two offspring at a time [syn: twinning]