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Equatorial :: Equatorial (n.) An instrument consisting of a telescope so mounted as to have two axes of motion at right angles to each other, one of them parallel to the axis of the earth, and each carrying a graduated circle, the one for measuring declination, and the other right ascension, or the hour angle, so that the telescope may be directed, even in the daytime, to any star or other object whose right ascension and declination are known. The motion in right ascension is sometimes communicated by clockw

Wheel :: Wheel (n.) A firework which, while burning, is caused to revolve on an axis by the reaction of the escaping gases..

Sporangia :: Sporangiophore (n.) The axis or receptacle in certain ferns (as Trichomanes), which bears the sporangia..

Revolve :: Revolve (v. t.) To cause to turn, as on an axis..

Tympanum :: Tympanum (n.) A drum-shaped wheel with spirally curved partitions by which water is raised to the axis when the wheel revolves with the lower part of the circumference submerged, -- used for raising water, as for irrigation..

Gorgoniacea :: Gorgoniacea (n. pl.) One of the principal divisions of Alcyonaria, including those forms which have a firm and usually branched axis, covered with a porous crust, or c/nenchyma, in which the polyp cells are situated..

Lap :: Lap (n.) A piece of brass, lead, or other soft metal, used to hold a cutting or polishing powder in cutting glass, gems, and the like, or in polishing cutlery, etc. It is usually in the form of wheel or disk, which revolves on a vertical axis..

Centrum :: Centrum (n.) The body, or axis, of a vertebra. See Vertebra..

Latus Rectum :: Latus rectum () The line drawn through a focus of a conic section parallel to the directrix and terminated both ways by the curve. It is the parameter of the principal axis. See Focus, and Parameter..

Root :: Root (n.) The descending, and commonly branching, axis of a plant, increasing in length by growth at its extremity only, not divided into joints, leafless and without buds, and having for its offices to fix the plant in the earth, to supply it with moisture and soluble matters, and sometimes to serve as a reservoir of nutriment for future growth. A true root, however, may never reach the ground, but may be attached to a wall, etc., as in the ivy, or may hang loosely in the air, as in some epiphy

Orthotropic :: Orthotropic (a.) Having the longer axis vertical; -- said of erect stems.

Ring :: Ring (n.) The solid generated by the revolution of a circle, or other figure, about an exterior straight line (as an axis) lying in the same plane as the circle or other figure..

Epistaxis :: Epistaxis (n.) Bleeding at the nose.

Neural :: Neural (a.) relating to the nerves or nervous system; taining to, situated in the region of, or on the side with, the neural, or cerebro-spinal, axis; -- opposed to hemal. As applied to vertebrates, neural is the same as dorsal; as applied to invertebrates it is usually the same as ventral. Cf. Hemal..

Lever :: Lever (n.) A rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forces are applied; -- used for transmitting and modifying force and motion. Specif., a bar of metal, wood, or other rigid substance, used to exert a pressure, or sustain a weight, at one point of its length, by receiving a force or power at a second, and turning at a third on a fixed point called a fulcrum. It is usually named as the first of the six mecha

Flexion :: Flexion (n.) The bending of a limb or joint; that motion of a joint which gives the distal member a continually decreasing angle with the axis of the proximal part; -- distinguished from extension.

Concavo-convex :: Concavo-convex (a.) Specifically, having such a combination of concave and convex sides as makes the focal axis the shortest line between them. See Illust. under Lens..

Abaxile :: Abaxile (a.) Away from the axis or central line; eccentric.

Pivot :: Pivot (n.) A fixed pin or short axis, on the end of which a wheel or other body turns..

Gyration :: Gyration (n.) The act of turning or whirling, as around a fixed center; a circular or spiral motion; motion about an axis; rotation; revolution..

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