[adjective, verb kon-keyv, kon-keyv; noun kon-keyv]
- a concave surface, part, line, or thing.
- Machinery. a concave piece, as one against which a drum rotates.
- to make concave.
Origin of concave
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for concave
In a concave mirror the top and bottom are inverted, but this is no transposition.Timaeus
I am bending them in concave cathode of force over the city.
I ran up the twisted, concave surface of a giant stem of some kind.The Terror from the Depths
Sewell Peaslee Wright
A dentist's mirror is concave; he sees your teeth enlarged in it.Common Science
Carleton W. Washburne
It was a concave lens, like some powerful optical instrument.The Whispering Spheres
Russell Robert Winterbotham
- curving inwards
- physics having one or two surfaces curved or ground in the shape of a section of the interior of a sphere, paraboloid, etca concave lens
- maths (of a polygon) containing an interior angle greater than 180°
- an obsolete word for hollow
- (tr) to make concave
C15: from Latin concavus arched, from cavus hollow
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
Word Origin and History for concave
Online Etymology Dictionary, © 2010 Douglas Harper
- Curved like the inner surface of a sphere.
- A concave surface, structure, or line.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- Curved inward, like the inside of a circle or sphere.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.