from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Flat on one side and convex on the other.

from The Century Dictionary.

  • Plane on one side and convex on the other.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Plane or flat on one side, and convex on the other. See convex, and lens.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Flat or plane on one side and rounded on the other, such that the center is thicker than the edges.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective flat on one side and convex on the other


Sorry, no etymologies found.


  • The subject of distortion was next treated of, and the manner in which the idea of a non distorting doublet could be evolved from a single bi-convex lens by division into two plano-convex lenses with a central diaphragm was shown.

    Scientific American Supplement, No. 415, December 15, 1883

  • Bricks still plano-convex; stamped inscriptions begin.

    How to Observe in Archaeology

  • The fourth glume is coriaceous or crustaceous, plano-convex, bisexual, 5-nerved and paleate; palea is as long as the glume.

    A Handbook of Some South Indian Grasses

  • We wandered along the excavated streets that were bordered by low walls of sun baked plano-convex bricks and marvelled at the state of preservation.

    Coming of Age: 1939-1946

  • In this way plano-convex lenses are easily and cheaply made.

    On Laboratory Arts

  • The _fourth glume_ is elliptic-oblong, plano-convex, subobtuse, smooth or shining, though faintly striate, coriaceous with incurved margins; _palea_ is coriaceous, as long as the glume, elliptic, faintly striate.

    A Handbook of Some South Indian Grasses

  • In fact, a plano-convex crystal lens has been found among the ruins of

    Scientific American Supplement, No. 392, July 7, 1883

  • Galileo's telescope consisted of two lenses -- one plano-convex, the other plano-concave, the latter being held next the eye.

    The Astronomy of Milton's 'Paradise Lost'

  • The spikelets are plano-convex, orbicular to oblong, obtuse, secund, 2-ranked on the flattened or triquetrous rachis of the spike-like branches of a raceme, one-flowered and falling off entire from the very short or obscure pedicels.

    A Handbook of Some South Indian Grasses

  • Bricks made this way were called plano-convex because five faces were flat and the sixth convex; each bore the imprint of a thumb on the convex face, formed as the brick was ejected from the mould.

    Coming of Age: 1939-1946


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