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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Ophthalmoscope :: Ophthalmoscope (n.) An instrument for viewing the interior of the eye, particularly the retina. Light is thrown into the eye by a mirror (usually concave) and the interior is then examined with or without the aid of a lens..

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..

Opisthocoelous :: Opisthocoelous (a.) Concave behind; -- applied especially to vertebrae in which the anterior end of the centrum is convex and the posterior concave.

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..

Procoelia :: Procoelia (n. pl.) A division of Crocodilia, including the true crocodiles and alligators, in which the dorsal vertebrae are concave in front..

Procoelian :: Procoelian (a.) Concave in front; as, procoelian vertebrae, which have the anterior end of the centra concave and the posterior convex..

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

Cove :: Cove (n.) A concave molding.

Camera Obscura :: Camera obscura () An apparatus in which the images of external objects, formed by a convex lens or a concave mirror, are thrown on a paper or other white surface placed in the focus of the lens or mirror within a darkened chamber, or box, so that the outlines may be traced..

Trochilus :: Trochilus (n.) An annular molding whose section is concave, like the edge of a pulley; -- called also scotia..

Plano-concave :: Plano-concave (a.) Plane or flat on one side, and concave on the other; as, a plano-concave lens. See Lens..

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..

Bruiser :: Bruiser (n.) A concave tool used in grinding lenses or the speculums of telescopes.

Talon :: Talon (n.) A kind of molding, concave at the bottom and convex at the top; -- usually called an ogee..

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

Plano- :: Plano- (a.) Combining forms signifying flat, level, plane; as planifolious, planimetry, plano-concave..

Ichthyosaurus :: Ichthyosaurus (n.) An extinct genus of marine reptiles; -- so named from their short, biconcave vertebrae, resembling those of fishes. Several species, varying in length from ten to thirty feet, are known from the Liassic, Oolitic, and Cretaceous formations..

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

Bowl :: Bowl (n.) A concave vessel of various forms (often approximately hemispherical), to hold liquids, etc..

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