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

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

Thecodontia :: Thecodontia (n. pl.) A group of fossil saurians having biconcave vertebrae and the teeth implanted in sockets.

Amphicoelous :: Amphicoelous (a.) Having both ends concave; biconcave; -- said of vertebrae.

Basin :: Basin (n.) A hollow vessel, of various forms and materials, used in the arts or manufactures, as that used by glass grinders for forming concave glasses, by hatters for molding a hat into shape, etc..

Cove :: Cove (v. t.) To arch over; to build in a hollow concave form; to make in the form of a cove.

Scotia :: Scotia (n.) A concave molding used especially in classical architecture.

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..

Inshave :: Inshave (n.) A plane for shaving or dressing the concave or inside faces of barrel staves.

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

Ichthyornis :: Ichthyornis (n.) An extinct genus of toothed birds found in the American Cretaceous formation. It is remarkable for having biconcave vertebrae, and sharp, conical teeth set in sockets. Its wings were well developed. It is the type of the order Odontotormae..

Belemnite :: Belemnite (n.) A conical calcareous fossil, tapering to a point at the lower extremity, with a conical cavity at the other end, where it is ordinarily broken; but when perfect it contains a small chambered cone, called the phragmocone, prolonged, on one side, into a delicate concave blade; the thunderstone. It is the internal shell of a cephalopod related to the sepia, and belonging to an extinct family. The belemnites are found in rocks of the Jurassic and Cretaceous ages..

Concavo-convex :: Concavo-convex (a.) Concave on one side and convex on the other, as an eggshell or a crescent..

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

Concave :: Concave (a.) Hollow; void of contents.

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

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

Triquetrous :: Triquetrous (a.) Three sided, the sides being plane or concave; having three salient angles or edges; trigonal..

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..

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

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