1. 
   unifacial
   [adj] - having but one principal or specialized surface
   Found op http://www.webdictionary.co.uk/definition.php?query=unifacial
   
   
2. 
   unifacial
   adjective having but one principal or specialized surface; `a primitive unifacial flint tool`
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=unifacial
   
   
3. 
   Unifacial
   • (a.) Having but one front surface; as, some foliaceous corals are unifacial, the polyp mouths being confined to one surface.
   Found op http://thinkexist.com/dictionary/meaning/unifacial/
   
   
4. 
   unifacial
   1) Having but one principal or specialized surface 2) Unidirectional
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/unifacial/1
   
   

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