Synonyms and related words :
Janus-like, ambidextrous, bifacial, bifold, biform, bifurcated, bilateral, binary, binate, biparous, bipartisan, bipartite, bivalent, conduplicate, dichotomous, dihedral, disomatous, double, double-faced, duadic, dual, dualistic, duple, duplex, duplicate, duplicated, dyadic, flanked, geminate, geminated, handed, identical, lateral, many-sided, matched, multilateral, one-sided, polyhedral, quadrilateral, second, secondary, sided, tetrahedral, three-sided, trihedral, trilateral, triquetrous, twain, twin, twinned, two, two-faced, two-level, two-ply, two-story, twofold, unilateral