[bahy-kon-keyv, bahy-kon-keyv]
concave on both sides, as a lens.

1825–35; bi-1 + concave

biconcavity [bahy-kuhn-kav-i-tee] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
biconcave (baɪˈkɒnkeɪv, ˌbaɪkɒnˈkeɪv)
(of a lens) having concave faces on both sides; concavo-concave

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

biconcave bi·con·cave (bī'kŏn-kāv', bī-kŏn'kāv')
Concave on both sides or surfaces.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
biconcave   (bī'kŏn-kāv')  Pronunciation Key 
Concave on both sides or surfaces.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Erythrocytes are tiny biconcave disks, thin in the middle and thicker around the periphery.
Circular pinhole collimation or focusing biconcave lenses.
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