English definition of Concave

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Definition of concave

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Concave (a.) 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 convex; as, a concave mirror; the concave arch of the sky..

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Dish :: Dish (n.) The state of being concave, or like a dish, or the degree of such concavity; as, the dish of a wheel..

Concave :: Concave (n.) A curved sheath or breasting for a revolving cylinder or roll.

Platycoelian :: Platycoelian (a.) Flat at the anterior and concave at the posterior end; -- said of the centra of the vertebrae of some extinct dinouaurs.

Efflower :: Efflower (v. t.) To remove the epidermis of (a skin) with a concave knife, blunt in its middle part, -- as in making chamois leather..

Crescent :: Crescent (n.) The increasing moon; the moon in her first quarter, or when defined by a concave and a convex edge; also, applied improperly to the old or decreasing moon in a like state..

Concave :: Concave (v. t.) To make hollow or concave.

Fillet :: Fillet (n.) A concave filling in of a reentrant angle where two surfaces meet, forming a rounded corner..

Castanets :: Castanets (n. pl.) Two small, concave shells of ivory or hard wood, shaped like spoons, fastened to the thumb, and beaten together with the middle finger; -- used by the Spaniards and Moors as an accompaniment to their dance and guitars..

Cup :: Cup (v. t.) To make concave or in the form of a cup; as, to cup the end of a screw..

Concavation :: Concavation (n.) The act of making concave.

Vaulted :: Vaulted (a.) Arched; concave; as, a vaulted roof..

Concavo-convex :: Concavo-convex (a.) Specifically, having such a combination of concave and convex sides as makes the focal axis the shortest line between them. See Illust. under Lens..

Gullet :: Gullet (n.) A concave cut made in the teeth of some saw blades.

Depress :: Depress (a.) Having the middle lower than the border; concave.

Concave :: Concave (a.) 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 convex; as, a concave mirror; the concave arch of the sky..

Hypotrochoid :: Hypotrochoid (n.) A curve, traced by a point in the radius, or radius produced, of a circle which rolls upon the concave side of a fixed circle. See Hypocycloid, Epicycloid, and Trochoid..

Biconcave :: Biconcave (a.) Concave on both sides; as, biconcave vertebrae..

Cymbiform :: Cymbiform (a.) Shaped like a boat; (Bot.) elongated and having the upper surface decidedly concave, as the glumes of many grasses..

Hypocycloid :: Hypocycloid (n.) A curve traced by a point in the circumference of a circle which rolls on the concave side in the fixed circle. Cf. Epicycloid, and Trochoid..

Cope :: Cope (n.) Anything regarded as extended over the head, as the arch or concave of the sky, the roof of a house, the arch over a door..