[ pley-noh-kon-keyv, -kon-keyv ]

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

Origin of plano-concave

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

Words Nearby plano-concave Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use plano-concave in a sentence

  • The achromatic lens consists of a double convex lens of crown glass combined with a plano-concave lens of flint glass.

    Physics | Willis Eugene Tower
  • And the correction is produced by the same plano-concave lens as that which corrects the spherical aberration.

  • The chromatic combination consists of a convex lens of crown backed by a concave, or plano-concave, lens of flint.

    Pleasures of the telescope | Garrett Serviss
  • If one of the radii becomes infinite, the lens is plano-concave (fig. 9, 5).

  • I have made another only with a plano concave, without any kind of reflection, divers also by means of reflection.

    Micrographia | Robert Hooke

British Dictionary definitions for plano-concave


/ (ˌpleɪnəʊˈkɒnkeɪv) /

  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