having two faces or fronts.
Archaeology. having the opposite surfaces alike, as some tools.

1880–85; bi-1 + facial

bifacially, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bifacial (baɪˈfeɪʃəl)
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 10th Edition
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American Heritage
Science Dictionary
bifacial   (bī-fā'shəl)  Pronunciation Key 
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
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