concave
IPA: kɑnkˈeɪv
noun
- A concave surface or curve.
- The vault of the sky.
- One of the celestial spheres of the Ptolemaic or geocentric model of the world.
- (manufacturing) An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
- (surfing) An indentation running along the base of a surfboard, intended to increase lift.
- (skateboarding) An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.
- (gambling) A playing card made concave for use in cheating.
verb
- To render concave, or increase the degree of concavity.
adjective
- Curved like the inner surface of a sphere or bowl.
- (geometry, not comparable, of a polygon) Not convex; having at least one internal angle greater than 180 degrees.
- (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.
- Hollow; empty.
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Examples of "concave" in Sentences
- The mirror is concave.
- A polygon that is not convex is called concave or reentrant.
- Concave aspheres are used for the correction of high myopia.
- The concave shape of the sail funnels the wind through the kite.
- The spot arc weldment takes the final shape of the concave portions.
- In the foyer of the Herschel building there is a large concave mirror.
- The valve is of concave shape and made of soft pliable material such as rubber.
- This "concave" image is from the roof of the mosque next to the Taj Mahal in Agra. 50mm, wide open at f/1.4.
- It flowed in a gentle concave from the road up the mountain, its farther boundary an unbroken line of timber.
- That surface of the bow which faces the string when drawn into action, that is, the concave arc, is called the belly of the bow.
- The last three types, called concave lenses, scatter parallel rays so that they do not come to a focus, but diverge widely after passage through the lens.
- Two other celestial bodies of the feminine gender, fixed for one brief week apiece on the theatrical "concave," moved quickly in the direction of "the road."
- The concave is a little mellower than I prefer riding, but it ran full length so forwards or backwards it still felt like it wanted to stick to my feet (thankfully!).
- Some had a kind of concave, cylindrical, stiff black cap, which appeared to be a great ornament among them, and, we thought, was only worn by men of note or warriors.
- It rises in a concave, which is glazed in the same manner as that I described in the house, and like that, defended on the outside from the pecking of birds by a wire net; with the difference, of its being painted green.
- Round the sides and ends of the huts, the families, (for several are lodged together) have their separate apartments, where they sleep, and sit at work, not upon benches, but in a kind of concave trench, which is dug all round the inside of the house, and covered with mats; so that this part is kept tolerably decent.