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bifacial

[bahy-fey-shuh l]
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adjective
  1. having two faces or fronts.
  2. Archaeology. having the opposite surfaces alike, as some tools.
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Origin of bifacial

First recorded in 1880–85; bi-1 + facial
Related formsbi·fa·cial·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for bifacial

bifacial

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
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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

bifacial in Science

bifacial

[bī-fāshəl]
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.