SG Heritage Dictionary

Biparous [Adjective] Webster's Dictionary 1828

Bringing forth two at a birth.

Biparous [Adjective] Webster's Dictionary 1913

Bringing forth two at a birth.

Duality Roget’s Thesaurus §89

V. pair, couple, bracket, yoke, conduplicate, mate, span

Adj. two, twin, dual, dualistic, double, binary, binomial, twin, biparous, dyadic, conduplicate, duplex, biduous, binate, diphyletic, dispermic, unijugate, tete-a-tete, coupled, conjugate, both, both the one and the other