American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Curved like the inner surface of a sphere.
- n. A concave surface, structure, or line.
- v. To make concave.
Century Dictionary and Cyclopedia
- Curved or rounded in the manner of the circumference of a circle or the surface of a sphere when viewed from the center; presenting a hollow or incurvation; incurved; hence, bounded by such a line or surface: as, a concave mirror. A concave bounding surface of a body is one which is so bent that a straight line joining any two points of it lies without the body. Thus, if a ball floats upon water, the common surface of the ball and water is concave if conceived as belonging to the water, and convex if conceived as belonging to the ball. A surface or curve is said to be concave toward the region which would be outside a body of which the curve or surface was a concave boundary.
- Hollow; empty.
- n. A hollow; an arch or vault; a concavity.
- n. Any inwardly curved portion of a machine: as, the concave of a thresher (the curved breast in which the cylinder works).
- n. A concave mirror.
- To make hollow.
- n. The vault or arch of heaven: as, “the blue concave.”
- n. A playing card so trimmed that it can be separated from others according to the purpose for which the pack was prepared.
- adj. curved like the inner surface of a sphere or bowl
- n. A concave surface or curve.
- n. The vault of the sky.
- n. One of the celestial spheres of the Ptolemaic or geocentric model of the world.
- n. manufacturing An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
- n. surfing An indentation running along the base of a surfboard, intended to increase lift.
- n. skateboarding An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.
- v. To render concave, or increase the degree of concavity.
GNU Webster's 1913
- adj. Hollow and curved or rounded; vaulted; -- said of the interior of a curved surface or line, as of the curve of the of the inner surface of an eggshell, in opposition to
- adj. rare Hollow; void of contents.
- n. A hollow; an arched vault; a cavity; a recess.
- n. (Mech.) A curved sheath or breasting for a revolving cylinder or roll.
- v. To make hollow or concave.
- adj. curving inward
- From Latin concavus. (Wiktionary)
- Middle English, from Latin concavus : com-, intensive pref.; see com- + cavus, hollow. (American Heritage® Dictionary of the English Language, Fourth Edition)
“It flowed in a gentle concave from the road up the mountain, its farther boundary an unbroken line of timber.”
“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.”
“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.”
“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.”
“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!).”
“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.”
“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.”
“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.”
“This "concave" image is from the roof of the mosque next to the Taj Mahal in Agra. 50mm, wide open at f/1.4.”
“Every cranny and crater and concave void in her being was transformed from parched to pulsing.”
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