Geometry. (of a polygon) having at least one interior angle greater than 180°.
a concave surface, part, line, or thing.
Machinery. a concave piece, as one against which a drum rotates.
to make concave.
- con·cave·ly, adverb
- con·cave·ness, noun
- sub·con·cave, adjective
- sub·con·cave·ly, adverb
- sub·con·cave·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use concave in a sentence
The concave metal strip starts higher under the heel, then swoops low under the forefoot before rounding up again under the toe, resulting in a springy ride that increases its rebound the harder you run.
Burin says a concave front could theoretically create a faster flow of water in the center, and it would also likely create more side-to-side stability.Use physics to pull off gravity-defying surfing moves | Noah Lederman | October 5, 2021 | Popular-Science
The concave leather exterior gives your headphones and ear pads a safe and cozy place to sleep, and the cork feet prevent them from being knocked over.The best headphone stands for audiophiles, gamers, and anyone with a desk | Irena Collaku | July 23, 2021 | Popular-Science
A concave blade will easily make big cuts through softer materials.Three Questions to Ask Yourself Before Buying a Knife | Wes Siler | September 3, 2020 | Outside Online
This wireless keyboard has concave keys to snugly fit your fingertips, creating an ultra-comfortable typing experience.
Sagging milk-filled breasts must appear perky; the once-swollen abdomen is made concave.
Ellis's patent boot studs to save the sole, and the Euknemida, or concave-convex fastening springs, are the latest novelties.Showell's Dictionary of Birmingham | Thomas T. Harman and Walter Showell
Lamb turned the paper over and winked at himself in the concave mirror of the semi-circle of bar.
The seat should slope downward a little toward the back, be slightly concave, and have rounded edges in front.Essays In Pastoral Medicine | Austin Malley
Of the two broader sides one was concave, the other convex; while of the narrower sides one was flat and the other indented.The Private Life of the Romans | Harold Whetstone Johnston
His hair is long and black, and in his throat is a thick concave bone.Buffon's Natural History. Volume IX (of 10) | Georges Louis Leclerc de Buffon
British Dictionary definitions for concave
physics having one or two surfaces curved or ground in the shape of a section of the interior of a sphere, paraboloid, etc: a concave lens
maths (of a polygon) containing an interior angle greater than 180°
an obsolete word for hollow
(tr) to make concave
- Compare convex
- concavely, adverb
- concaveness, noun
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
Scientific definitions for concave
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.