u·ni·fa·cial 
(y′nə-fāshəl)
(y′nə-fāshəl)adj.
1. Having, presenting, or oriented toward a single face: unifacial leaves.
2. Archaeology Flaked in such a way as to produce a cutting edge that is sharp on one side only. Used of a stone tool.
u′ni·facial·ly adv.