from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The state of being curved like the inner surface of a sphere.
  • n. A surface or structure configured in such a curve: "a perfect concavity of white sand lined with palm . . . trees” ( Islands).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The state of being concave
  • n. A concave structure or surface

from the GNU version of the Collaborative International Dictionary of English

  • n. A concave surface, or the space bounded by it; the state of being concave.

from The Century Dictionary and Cyclopedia

  • n. The state of being concave; hollowness.
  • n. A concave surface, or the space contained in it; the internal surface of a hollow curved body, or the space within such body; any hollow space which is more or less spherical.

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

  • n. the property possessed by a concave shape
  • n. a shape that curves or bends inward


Sorry, no etymologies found.


  • The central part of the posterior surface presents a deep concavity which is moulded on the vertebral column and crura of the diaphragm.

    XI. Splanchnology. 2i. The Liver

  • On its upper side is seen a concavity which is produced by the section of the groove which runs along the convex and exterior (here upper) side of each branchial arch. ba, branchial artery in section, giving off the gill arteries (ga) to the adjacent sides of the gill leaflets, whence the blood is distributed in the leaflets; gv, the gill veins which run along the outer side of the gill leaflets, collecting the blood from them by minute veins and pouring it into bv, the branchial vein, which runs up the groove of the branchial arch and has the branchial artery superficial and exterior to it.

    The Common Frog

  • The play of concavity and convexity is announced by a pair of Tanktotems, watchful, hieratic personages built out of slender, vertical steel components and sliced tank ends.

    Works of Many Dimensions

  • Learn about gradient, structure, concavity, and maybe even make your chicken-scratch a little more legible, no matter what your gender.

    Boing Boing

  • It occupies another concavity 10 km west of Lake Enriquillo, separated from it by the Jimaní anticline.


  • The space inside a hot water bottle, when cast, simply produces a duplicate bottle; the space around a bath only reproduces its familiar concavity.

    Rachel Whiteread: Drawings

  • I use the Champs Elysees because of the “concavity” in the long axis of the road Main Street is a hill—I saw somewhere that in pioneer days riding down the hill on trams was free, but you had to pay to go up.

    Olympic Line (short) closure notice « Stephen Rees's blog

  • Lewis, I understand you were talking about the slope concavity of the Champs Elysee…

    Olympic Line (short) closure notice « Stephen Rees's blog

  • His memory was able to adhere to her smoothness, to her rough parts, to her every swelling and concavity, but only in a way that was like an ache—or like a hunger trying to feed upon itself.

    Here Comes Another Lesson

  • Casting to and fro, he soon found what he expected, a concavity in the tumbled snow like material, slightly aboil.

    The Clique


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