[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
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.
- 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.