concave

English

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concave

Wikipedia

Etymology

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

Pronunciation

• (UK) IPA^(key): /ˈkɒn.keɪv/, /kɒnˈkeɪv/
• (US) IPA^(key): /ˈkɑn.keɪv/, /kɑnˈkeɪv/, /kənˈkeɪv/

  • Audio (US):

    (file)

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.
   • c. 1598–1600 (date written), William Shakespeare, “As You Like It”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act III, scene iv]:

     as concave […] as a worm-eaten nut

Synonyms

• concavous (obsolete)

Antonyms

• convex

Derived terms

• biconcave
• concavation
• concave envelope
• concave function
• concavely
• concaveness
• concavification
• concavify
• concavity
• concavoconcave
• convexoconcave
• double concave
• nonconcave
• planoconcave
• proconcave
• pseudoconcave
• quasiconcave
• subconcave
• upper concave envelope

Translations

curved inward

Arabic: مُقَعَّر (muqaʕʕar), مُجَوَّف (mujawwaf) Armenian: գոգավոր (hy) (gogavor) Asturian: cóncavu Bengali: অবতল (bn) (obotol) Bulgarian: вдлъбнат (vdlǎbnat) Catalan: còncau (ca) Chinese: Mandarin: 凹 (zh) (āo) Cornish: kowgrom Czech: vydutý, konkávní (cs) Danish: konkav Dutch: hol (nl) Esperanto: kava Estonian: nõgus Faroese: innskaraður, innhjólaður Finnish: kovera (fi), konkaavi (fi) French: concave (fr) Galician: cóncavo (gl) German: konkav (de), nach innen gewölbt, eingewölbt Greek: κοίλος (el) (koílos) Hawaiian: ʻeʻele Hungarian: homorú (hu), konkáv (hu) Icelandic: íhvolfur Indonesian: cekung (id) Italian: concavo (it) Japanese: 凹面 (ja) (おうめん, ōmen) Kazakh: ойыс (oiys) Korean: 요면 (yomyeon) Latin: concavus Maori: areare, kōpapa Norwegian: Bokmål: konkav Nynorsk: konkav Persian: کاو (fa) (kâv) Polish: wklęsły (pl) Portuguese: côncavo (pt) Romanian: concav (ro) Russian: во́гнутый (ru) (vógnutyj) Slovak: dutý, vydutý, konkávny Spanish: cóncavo (es) Swedish: konkav (sv) Tagalog: malukong Thai: เว้า (th) (wáo) Turkish: konkav (tr), içbükey (tr) Tày: boóng Vietnamese: lõm (vi) Welsh: ceugrwm (cy) m, ceugrom f

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.
7. (gambling) A playing card made concave for use in cheating.

   Coordinate term: convex

Translations

A concave surface or curve

Bulgarian: вдлъбнатина (bg) (vdlǎbnatina) Kurdish: Northern Kurdish: rûçal (ku) Russian: невы́пуклый (ru) (nevýpuklyj) Thai: รูปร่างที่นูน

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.

Derived terms

• concaver

Translations

To render concave, or increase the degree of concavity.

Bulgarian: вдлъбвам (vdlǎbvam)

French

Etymology

Inherited from Old French concave, borrowed from Latin concavus.

Pronunciation

• Audio (France (Brétigny-sur-Orge)):

  (file)

Adjective

concave (plural concaves)

1. concave

Descendants

• → Turkish: konkav

Further reading

• “concave”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

Italian

Adjective

concave

1. feminine plural of concavo

Latin

Adjective

concave

1. vocative masculine singular of concavus