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plano-concave

American  
[pley-noh-kon-keyv, -kon-keyv] / ˌpleɪ noʊˈkɒn keɪv, -kɒnˈkeɪv /

adjective

Optics.

  1. pertaining to or noting a lens that is plane on one side and concave on the other.

plano-concave British  
/ ˌpleɪnəʊˈkɒnkeɪv /

adjective

  1. (of a lens) having one side concave and the other side plane

"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

Etymology

Origin of plano-concave

First recorded in 1685–95; plano- 1 + concave

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.