concave

Adj

1. Curved like the inner surface of a sphere or bowl.
2. (not-comparable) Not convex; having at least one internal angle greater than 180 degrees.
3. (not-comparable) Satisfying the property that all segments connecting two points on the function's graph lie below the function.
4. Hollow; empty.

Noun

1. A concave surface or curve.
2. The vault of the sky.
3. One of the celestial spheres of the Ptolemaic or geocentric model of the world.
4. An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
5. An indentation running along the base of a surfboard, intended to increase lift.
6. An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.
7. A playing card made concave for use in cheating.

Verb

To render concave, or increase the degree of concavity.

Pronounced as (IPA)

/ˈkɒn.keɪv/

Etymology

Inherited from Middle English: concave

In summary

From Middle English concave, from Old French concave, from Latin concavus.

Synonyms

hollow

sunken

cavity

dent

dished

depression

indented

intaglio

concavity

be hollowed out

vault

re-entrant

dented

groove

hemisphere

hole

🕳️

holed

holey

hollowness

indentation

low-lying

muddy

pocket

pothole

recession

scarf

🧣

scoop

sink down

sulcus

tumble down

caved in

concave surface

curving inward

bowl-shaped

concave camber

notch board

splineway

flattened out

holl

make hollow

rearward face

appropriate

patellate

arch

boggy

cave

cave in

cavernous

chamfer

collapse

Translations

concave

concavo

cóncavo

konkav

wklęsły

côncavo

içbükey

hol

🕳️

còncau

konkav

κοίλος

ingevallen

concaaf

hohl

concavus