The Collaborative International Dictionary of English v.0.48:
Bifacial \Bi*fa"cial\, a. [Pref. bi- + facial.] Having the opposite surfaces alike. [1913 Webster]WordNet (r) 3.0 (2006):
bifacial adj 1: having two faces or fronts; "the Roman Janus is bifacial" [syn: biface, bifacial]