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Webster 1913 Edition

Concave

Con′cave

(kŏṉ-kā-v′ or kŏn′-; 277)
,
Adj.
[L.
concavus
;
con-
+
cavus
hollow: cf. F.
concave
. See
Cave
a hollow.]
1.
Hollow and curved or rounded; vaulted; – said of the interior of a curved surface or line, as of the curve of the of the inner surface of an eggshell, in opposition to
convex
;
as, a
concave
mirror; the
concave
arch of the sky
.
2.
Hollow; void of contents.
[R.]
As
concave
. . . as a worm-eaten nut.
Shakespeare

Con′cave

,
Noun.
[L.
concavum
.]
1.
A hollow; an arched vault; a cavity; a recess.
Up to the fiery
concave
towering hight.
Milton.
2.
(Mech.)
A curved sheath or breasting for a revolving cylinder or roll.

Con′cave

,
Verb.
T.
[
imp. & p. p.
concaved
;
p. pr. & vb. n.
Concaving
.]
To make hollow or concave.

Webster 1828 Edition

Concave

CONCAVE

,
Adj.
[L. Hollow. See Cave.]
1.
Hollow, and arched or rounded, as the inner surface of a spherical body; opposed to convex; as a concave glass.
2.
Hollow, in a general sense; as the concave shores of the Tiber.
3.
In botany, a concave leaf is one whose edge stands above the disk.

CONCAVE

,
Noun.
A hollow; an arch, or vault; as the ethereal concave.

CONCAVE

,
Verb.
T.
To make hollow.

Definition 2024

concave

concave

English

Top: a spoon with its convex side up.
Bottom: a spoon with its concave side up.
A concave polygon.
A concave function.

Adjective

concave ‎(comparative more concave, superlative most concave)

  1. curved like the inner surface of a sphere or bowl
  2. (geometry, not comparable, of a polygon) not convex; having at least one internal angle greater than 180 degrees..
  3. (functional analysis, not comparable, of a real-valued function on the reals) satisfying the property that all segments connecting two points on the function's graph lie below the function.
  4. hollow; empty
    • Shakespeare
      as concave […] as a worm-eaten nut

Antonyms

Translations

Derived terms

Noun

concave ‎(plural concaves)

  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.
    Aristotle makes [Fire] to move to the concave of the Moon. - Thomas Salusbury (1661).
  4. (manufacturing) An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
  5. (surfing) An indentation running along the base of a surfboard, intended to increase lift.
  6. (skateboarding) An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.

Translations

Verb

concave ‎(third-person singular simple present concaves, present participle concaving, simple past and past participle concaved)

  1. To render concave, or increase the degree of concavity.

Translations

Derived terms

  • concaver

French

Etymology

From Old French concave, a borrowing from Latin concavus.

Adjective

concave m, f ‎(plural concaves)

  1. concave

Italian

Adjective

concave

  1. feminine plural of concavo

Latin

Adjective

concave

  1. vocative masculine singular of concavus

Etymology

Borrowing from Old French concave, from Latin concavus.

Pronunciation

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