concave

Fetched 2026-10-26 (cache).

Synonyms: conclave, conceave

Antonyms: conclave, conceave

Related words from Datamuse; suggestions, not definitions.

Adjective

1. [[curved|Curved]] like the [[inner]] surface of a [[sphere]] or bowl.
2. {{lb|en|geometry|not comparable|of a [[polygon]]}} Not [[convex]]; having at least one internal angle greater than 180 degrees.
3. {{lb|en|functional analysis|not comparable|of a [[real-valued]] [[function]] on the [[real]]s}} Satisfying the property that all segments connecting two points on the function's graph lie below the function.
4. [[hollow|Hollow]]; [[empty]].

Noun

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

Verb

1. To render [[#Adjective|concave]], or increase the degree of [[concavity]].

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.