(a.) Expressing, or consisting of, the number two; belonging to two; as, the dual number of nouns, etc. , in Greek.

Janus-like ambidextrous bifacial bifold biform bifurcated bilateral binary binate biparous bipartisan bipartite bivalent conduplicate dichotomous disomatous double double-barreled double-faced duadic dualistic duple duplex duplicate duplicated dyadic geminate geminated identical matched paired second secondary twain twin twinned two two-faced two-level two-ply two-sided two-story twofold