concave
adjective · noun · verbB1Định nghĩa theo từ loại
Tính từ
adjective- 1.
Curved like the inner surface of a sphere or bowl.
- 2.
(not comparable)(geometry, not comparable, of a polygon) Not convex; having at least one internal angle greater than 180 degrees.
- 3.
(not comparable)(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.
Danh từ
noun- 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.
Động từ
verb- 1.
To render concave, or increase the degree of concavity.
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Nguồn gốc từ
ine-pro From Middle English concave, from Old French concave, from Latin concavus.