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Connected with both the nose and the mouth; as, the nasobuccal groove in the skate.

A reduction in size near the end of an object, formed by a groove around it; as, a neck forming the journal of a shaft.

The cutting lip which projects downward at the edge of a boring bit and cuts a circular groove in the wood to limit the size of the hole that is bored.

An elastic cartilagelike rod which is developed beneath the medullary groove in the vertebrate embryo, and constitutes the primitive axial skeleton around which the centra of the vertebræ and the posterior part of the base of the skull are developed; the chorda dorsalis. See Illust. of Ectoderm.

An extinct order of ostrichlike aquatic birds having teeth, which are set in a groove in the jaw. It includes Hesperornis, and allied genera. See Hesperornis. [Written also Odontholcae, and Odontoholcae.]

The part of the carapace of a crustacean situated behind the cervical groove.

-shaped echinoderms having a disklike body, with slender, articulated arms, which are not grooved beneath and are often very fragile; -- called also Ophiuroida and Ophiuridea. See Illust. under Brittle star.

A division of serpents which have some of the posterior maxillary teeth grooved for fangs.

A board having its edges inserted in the groove of a surrounding frame; as, the panel of a door.

n drill (Mech.), a drill which is turned by pushing a nut back and forth along a spirally grooved drill holder. -- Persian fire (Med.), malignant pustule. -- Persian powder. See Insect powder, under Insect. -- Persian red. See Indian red (a), under Indian. -- Persian wheel, a noria; a tympanum. See Noria.…

bridge. Pug piling, sheet piles connected together at the edges by dovetailed tongues and grooves. -- Sheet piling, a series of piles made of planks or half logs driven edge to edge, -- used to form the walls of cofferdams, etc.

A joiner's plane for making grooves; a grooving plane.

ecies of serpents, which, besides having the cavity for the pulp, is either perforated or grooved by a longitudinal canal, at the lower end of which the duct of the poison gland terminates. See Illust. under Fang. -- Poison gland (Biol.), a gland, in animals or plants, which secretes an acrid or venomous matter, that…

Having grooves or furrows broader than the intervening ridges; furrowed.

tian writers who flourished before the Council of Nice, A. D. 325. Shipley. -- Primitive groove (Anat.), a depression or groove in the epiblast of the primitive streak. It is not connected with the medullary groove, which appears later and in front of it. -- Primitive plane (Spherical Projection), the plane upon whic…

A suborder of serpents including those that have permanently erect grooved poison fangs, with ordinary teeth behind them in the jaws. It includes the cobras, the asps, and the sea snakes. Called also Proteroglyphia.

A wheel with a broad rim, or grooved rim, for transmitting power from, or imparting power to, the different parts of machinery, or for changing the direction of motion, by means of a belt, cord, rope, or chain.

A restangular longitudinal recess or groove, cut in the corner or edge of any body; a rabbet. See Rabbet.

A trough or sluice having cleats, grooves, or steps across the bottom for holding quicksilver and catching particles of gold when auriferous earth is washed; also, one of the cleats, grooves, or steps in such a trough. Also called ripple.

A gun, the inside of whose barrel is grooved with spiral channels, thus giving the ball a rotary motion and insuring greater accuracy of fire. As a military firearm it has superseded the musket.