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bifacial

[bahy-fey-shuh l] /baɪˈfeɪ ʃəl/
adjective
1.
having two faces or fronts.
2.
Archaeology. having the opposite surfaces alike, as some tools.
Origin
1880-1885
1880-85; bi-1 + facial
Related forms
bifacially, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for bi facial

bifacial

/baɪˈfeɪʃəl/
adjective
1.
having two faces or surfaces
2.
(botany) (of leaves, etc) having upper and lower surfaces differing from each other
3.
(archaeol) (of flints) flaked by percussion from two sides along the chopping edge
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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bi facial in Science
bifacial
  (bī-fā'shəl)   
Flaked in such a way as to produce a cutting edge that is sharp on both sides. Used of a stone tool. ◇ Bifacial tools are known as a bifaces and include such early core tools as hand axes and cleavers as well as later flake tools such as blades and spear or arrow points. Compare unifacial.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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