Top: a spoon with itsconvex side up.
Bottom: a spoon with itsconcave side up.
A concave polygon.
A concave (concave downwards) function.FromMiddle Englishconcave, fromOld Frenchconcave, fromLatinconcavus.
- (UK)IPA(key): /ˈkɒn.keɪv/,/kɒnˈkeɪv/
- (US)IPA(key): /ˈkɑn.keɪv/,/kɑnˈkeɪv/,/kənˈkeɪv/
concave (comparativemoreconcave,superlativemostconcave)
- Curved like theinner surface of asphere or bowl.
- (geometry, not comparable, of apolygon) Notconvex; having at least one internal angle greater than 180 degrees.
- (functional analysis, not comparable, of areal-valuedfunction on thereals) Satisfying the property that all segments connecting two points on the function's graph lie below the function.
- Hollow;empty.
c.1598–1600 (date written),William Shakespeare, “As You Like It”, inMr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, andEd[ward] Blount, published1623,→OCLC,[Act III, scene iv]:asconcave[…] as a worm-eaten nut
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),nachinnengewölbt,eingewölbt
- Greek:κοίλος (el)(koílos)
- Hawaiian:ʻeʻele
- Hungarian:homorú (hu),konkáv (hu)
- Icelandic:íhvolfur
- 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
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concave (pluralconcaves)
- Aconcave surface or curve.
- The vault of the sky.
- One of the celestialspheres of thePtolemaic orgeocentric model of the world.
- Aristotle makes [Fire] to move to the concave of the Moon. - Thomas Salusbury (1661).
- (manufacturing) An element of a curved grid used to separate desirable material from tailings or chaff inmining andharvesting.
- (surfing) An indentation running along the base of asurfboard, intended to increaselift.
- (skateboarding) An indented area on the top of askateboard, providing a position for foot placement and increasing board strength.
- (gambling) Aplaying card made concave for use incheating.
- Coordinate term:convex
A concave surface or curve
concave (third-person singular simple presentconcaves,present participleconcaving,simple past and past participleconcaved)
- To renderconcave, or increase the degree ofconcavity.
To render concave, or increase the degree of concavity.
Inherited fromOld Frenchconcave, borrowed fromLatinconcavus.
concave (pluralconcaves)
- concave
concave
- feminineplural ofconcavo
concave
- vocativemasculinesingular ofconcavus
