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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..

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..

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

Cove :: Cove (n.) A member, whose section is a concave curve, used especially with regard to an inner roof or ceiling, as around a skylight..

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

Dishing :: Dishing (a.) Dish-shaped; concave.

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

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

Lieberkuhn :: Lieberkuhn (n.) A concave metallic mirror attached to the object-glass end of a microscope, to throw down light on opaque objects; a reflector..

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

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..

Subconformable :: Subconcave (a.) Slightly concave.

Vessel :: Vessel (n.) A hollow or concave utensil for holding anything; a hollow receptacle of any kind, as a hogshead, a barrel, a firkin, a bottle, a kettle, a cup, a bowl, etc..

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

Hollow :: Hollow (a.) Depressed; concave; gaunt; sunken.

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

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

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

Condyle :: Condyle (n.) A bony prominence; particularly, an eminence at the end of a bone bearing a rounded articular surface; -- sometimes applied also to a concave articular surface..

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