concave


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Related to concave: concave polygon, Concave function, Concave chest

concave

1. Physics having one or two surfaces curved or ground in the shape of a section of the interior of a sphere, paraboloid, etc.
2. Maths (of a polygon) containing an interior angle greater than 180°

concave

(kong-kayv , kong -kayv) Curving inward. A concave mirror converges light. A biconcave or planoconcave lens, thinner in the middle than at the edges, has a diverging action.

Concave

Forms that are curved like the inner surface of a hollow sphere or circular arc.

concave

[′kän‚kāv]
(science and technology)
Having a curved form which bulges inward resembling the interior of a sphere or cylinder or a section of these bodies.
References in classic literature ?
The cylinder once lighted, the hydrogen in the spiral and in the concave cone becomes heated, and rapidly ascends through the pipe that leads to the upper part of the balloon.
Some parts brilliantly lighted, especially on its concave part, showed the presence of high mountains, often disappearing behind thick spots, which are never seen on the lunar disc.
In ordinary combs it has appeared to me that the bees do not always succeed in working at exactly the same rate from the opposite sides; for I have noticed half-completed rhombs at the base of a just-commenced cell, which were slightly concave on one side, where I suppose that the bees had excavated too quickly, and convex on the opposed side, where the bees had worked less quickly.
I cannot refrain from once again remarking on the singularity of these complex structures -- a great sandy and generally concave disk rises abruptly from the unfathomable ocean, with its central expanse studded, and its edge symmetrically bordered with oval basins of coral-rock just lipping the surface of the sea, sometimes clothed with vegetation, and each containing a lake of clear water!
The fierce flame fluttered like a silk flag, throwing an angry swaying glare mingled with moving shadows over the poop, lighting up the concave surfaces of the sails, gleaming on the wet paint of the white rails.
And the same object appears straight when looked at out of the water, and crooked when in the water; and the concave becomes convex, owing to the illusion about colours to which the sight is liable.
It will certainly accept your own measure of your doing and being, whether you sneak about and deny your own name, or whether you see your work produced to the concave sphere of the heavens, one with the revolution of the stars.
It flowed in a gentle concave from the road up the mountain, its farther boundary an unbroken line of timber.
A moon so little less than full that the eye could barely detect its slight tendency to become concave, shone serenely, creating a desirable combination of black shadows where the prowler might hide and great stretches of light in which the prowler might reveal his wickedness without disguise.
The flanks of the dark, moving mass, were advanced in such a manner as to make a concave line of the front, and every fierce eye, that was glaring from the shaggy wilderness of hair in which the entire heads of the males were enveloped, was riveted with mad anxiety on the thicket.
The Concave Cutting Board, meanwhile, turns the traditional carving board inside out, with a design that features a concave center to hold juices in place and Gripper technology to hold the board still.
It follows a fire in Linthwaite, when the concentration of the sun's rays by a magnifying concave mirror set a box of Christmas decorations alight.