# concave

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concave
left to right: biconcave,
plano-concave, and
concavo-convex lenses

## con·cave

(kŏn-kāv′, kŏn′kāv′)
Curved like the inner surface of a sphere.
n.
A concave surface, structure, or line.
tr.v. con·caved, con·cav·ing, con·caves
To make concave.

[Middle English, from Latin concavus : com-, intensive pref.; see com- + cavus, hollow; see keuə- in Indo-European roots.]

con·cave′ness n.

## concave

(ˈkɒnkeɪv; kɒnˈkeɪv)
1. curving inwards
2. (General Physics) 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.
3. (Mathematics) maths (of a polygon) containing an interior angle greater than 180°
4. an obsolete word for hollow
vb
(tr) to make concave
[C15: from Latin concavus arched, from cavus hollow]
ˈconcaveness n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

## con•cave

(adj., v. kɒnˈkeɪv, ˈkɒn keɪv; n. ˈkɒn keɪv)

1. curved or hollowed inward like the inside of a circle or sphere. Compare convex (def. 1).
2. (of a polygon) having at least one interior angle greater than 180°.
n.
3. a concave surface, part, line, or thing.
v.t.
4. to make concave.
[1375–1425; late Middle English (< Middle French) < Latin concavus hollow. See con-, cave]
con•cave′ness, n.

## con·cave

(kŏn′kāv′)
Curved inward, like the inside of a circle or sphere.

## concave

Past participle: concaved
Gerund: concaving

Imperative
concave
concave
Present
I concave
you concave
he/she/it concaves
we concave
you concave
they concave
Preterite
I concaved
you concaved
he/she/it concaved
we concaved
you concaved
they concaved
Present Continuous
I am concaving
you are concaving
he/she/it is concaving
we are concaving
you are concaving
they are concaving
Present Perfect
I have concaved
you have concaved
he/she/it has concaved
we have concaved
you have concaved
they have concaved
Past Continuous
I was concaving
you were concaving
he/she/it was concaving
we were concaving
you were concaving
they were concaving
Past Perfect
Future
I will concave
you will concave
he/she/it will concave
we will concave
you will concave
they will concave
Future Perfect
I will have concaved
you will have concaved
he/she/it will have concaved
we will have concaved
you will have concaved
they will have concaved
Future Continuous
I will be concaving
you will be concaving
he/she/it will be concaving
we will be concaving
you will be concaving
they will be concaving
Present Perfect Continuous
I have been concaving
you have been concaving
he/she/it has been concaving
we have been concaving
you have been concaving
they have been concaving
Future Perfect Continuous
I will have been concaving
you will have been concaving
he/she/it will have been concaving
we will have been concaving
you will have been concaving
they will have been concaving
Past Perfect Continuous
Conditional
I would concave
you would concave
he/she/it would concave
we would concave
you would concave
they would concave
Past Conditional
I would have concaved
you would have concaved
he/she/it would have concaved
we would have concaved
you would have concaved
they would have concaved
Collins English Verb Tables © HarperCollins Publishers 2011

## concave

curving inward
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
 Adj. 1 concave - curving inwardintrusive - thrusting inward; "an intrusive arm of the sea"bulging, convex - curving or bulging outward
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.

## concave

adjective Remove the flesh from the concave part of the shell.
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002

## concave

Curving inward:
Translations
مُقعَّـر
vydutý
hulkonkav
nõgus
homorúkonkáv
íhvolfur
요면
įdubęsįgaubtasįgaubtumas
iedobtsieliekts
vydutý
içbükeykonkav

## concave

Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

## concave

Collins English/French Electronic Resource. © HarperCollins Publishers 2005

## concave

Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

## concave

Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995

## concave

(of an object or surface) curved inwards. Spoons are concave.
conˈcavity (-ˈkӕ-) noun
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.

## con·cave

a. cóncavo-a.
English-Spanish Medical Dictionary © Farlex 2012

## concave

References in classic literature ?
Before again issuing from it, this spiral runs into a small cone with a concave base, that is turned downward in the shape of a spherical cap.
The city of Wintoncester, that fine old city, aforetime capital of Wessex, lay amidst its convex and concave downlands in all the brightness and warmth of a July morning.
It terminated in a concave breast of rock, nearly vertical and destitute of vegetation.
In the middle of the concave side, there is a groove twelve inches deep, in which the extremities of the axle are lodged, and turned round as there is occasion.
The great height at which the kite hung made a great concave curve in the string, so that as the runners went up they made a flapping sound.
A moon so little less than full that the eye could barely detect its slight tendency to become concave, shone serenely, creating a desirable combination of black shadows where the prowler might hide and great stretches of light in which the prowler might reveal his wickedness without disguise.
On this impression he did ever the same thing; he put his stick noiselessly away in a corner - feeling the place once more in the likeness of some great glass bowl, all precious concave crystal, set delicately humming by the play of a moist finger round its edge.
The yellow men were armed with two swords, and a short javelin was slung across the back of each, while from their left arms hung cuplike shields no larger than a dinner plate, the concave sides of which turned outward toward an antagonist.
The fierce flame fluttered like a silk flag, throwing an angry swaying glare mingled with moving shadows over the poop, lighting up the concave surfaces of the sails, gleaming on the wet paint of the white rails.
It flowed in a gentle concave from the road up the mountain, its farther boundary an unbroken line of timber.
Then strait commands that at the warlike sound Of Trumpets loud and Clarions be upreard His mighty Standard; that proud honour claim'd AZAZEL as his right, a Cherube tall: Who forthwith from the glittering Staff unfurld Th' Imperial Ensign, which full high advanc't Shon like a Meteor streaming to the Wind With Gemms and Golden lustre rich imblaz'd, Seraphic arms and Trophies: all the while Sonorous mettal blowing Martial sounds: At which the universal Host upsent A shout that tore Hells Concave, and beyond Frighted the Reign of CHAOS and old Night.
Mem : at 25,000 feet elevation the sky appears nearly black, and the stars are distinctly visible ; while the sea does not seem convex (as one might suppose) but absolutely and most unequivocally concave.{*1}

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