different between concave vs cavity

English

Etymology

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

Pronunciation

• IPA^(key): /?k??ke?v/

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

Antonyms

• convex

Derived terms

• concavely
• concaveness
• concavity

Translations

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

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

French

Etymology

From Old French concave, borrowed from Latin concavus.

Adjective

concave (plural concaves)

1. concave

Descendants

• ? Turkish: konkav

Further reading

• “concave” in Trésor de la langue française informatisé (The Digitized Treasury of the French Language).

Italian

Adjective

concave

1. feminine plural of concavo

Latin

Adjective

concave

1. vocative masculine singular of concavus

English

Etymology

From Middle English cavity, from Middle French cavité, from Late Latin cavitas, from Latin cavus (“hollow”).

Pronunciation

• IPA^(key): /?kæv?ti/
• • (US) IPA^(key): [?k?æv??i]

Noun

cavity (plural cavities)

1. A hole or hollow depression.
2. A hollow area within the body (such as the sinuses).
3. (dentistry) A small or large hole in a tooth caused by caries; often also a soft area adjacent to the hole also affected by caries.

Synonyms

• See also Thesaurus:hole
• (dentistry): caries

Derived terms

Related terms

• cave
• concave
• excavate
• excavation
• excavator

Translations

Further reading

• cavity in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• cavity in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
• cavity at OneLook Dictionary Search