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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..

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

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

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

Convex :: Convex (a.) Rising or swelling into a spherical or rounded form; regularly protuberant or bulging; -- said of a spherical surface or curved line when viewed from without, in opposition to concave..

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..

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

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

Ginglymodi :: Ginglymodi (n.) An order of ganoid fishes, including the modern gar pikes and many allied fossil forms. They have rhombic, ganoid scales, a heterocercal tail, paired fins without an axis, fulcra on the fins, and a bony skeleton, with the vertebrae convex in front and concave behind, forming a ball and socket joint. See Ganoidel..

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..

Gorge :: Gorge (n.) A concave molding; a cavetto.

Tocororo :: Tocororo (n.) A cuban trogon (Priotelus temnurus) having a serrated bill and a tail concave at the end.

Palm :: Palm (n.) The inner and somewhat concave part of the hand between the bases of the fingers and the wrist.

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

Concavity :: Concavity (n.) A concave surface, or the space bounded by it; the state of being concave..

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..

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

Subconformable :: Subconcave (a.) Slightly concave.

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

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

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