[pley-noh-kon-keyv, -kon-keyv]
adjective Optics.
pertaining to or noting a lens that is plane on one side and concave on the other.

1685–95; plano-1 + concave Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plano-concave (ˌpleɪnəʊˈkɒnkeɪv)
(of a lens) having one side concave and the other side plane

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

planoconcave pla·no·con·cave (plā'nō-kŏn-kāv', -kŏn'kāv')
Flat on one side and concave on the other.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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