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Of or pertaining to the occipital bone and second vertebra, or axis.

, or Odontoid peg (Anat.), the anterior process of the centrum of the second vertebra, or axis, in birds and mammals. See Axis.

o eyes when directed to the same point; -- sometimes called binocular parallax. -- Optic axis. (Opt.) (a) A line drawn through the center of the eye perpendicular to its anterior and posterior surfaces. In a normal eye it is in the direction of the optic axis that objects are most distinctly seen. (b) The line in a do…

The distance of any point in a curve or a straight line, measured on a line called the axis of ordinates or on a line parallel to it, from another line called the axis of abscissas, on which the corresponding abscissa of the point is measured.

The tendency of a revolving body, when suspended in a certain way, to bring the axis of rotation into parallelism with the earth's axis.

The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis.

Having the axis of an ovule or seed straight from the hilum and chalaza to the orifice or the micropyle; atropous.

Having the longer axis vertical; -- said of erect stems. Encyc. Brit.

d, undoubtedly; but the extreme points of the oscillation were not very remote. Macaulay. Axis of oscillation, Center of oscillation. See under Axis, and Center.

ted by revolving the portion of a parabola cut off by a line drawn at right angles to the axis of the curve, about that line as an axis. -- Parabolic spiral, a spiral curve conceived to be formed by the periphery of a semiparabola when its axis is wrapped about a circle; also, any other spiral curve having an analogy…

The solid generated by the rotation of a parabola about its axis; any surface of the second order whose sections by planes parallel to a given line are parabolas.

Of pertaining to, or characterized by, parataxis.

On either side of the axis of the skeleton.

Attached to the main wall of the ovary, and not to the axis; -- said of a placenta.

Cleaving in more directions than one, parallel to the axis.

The wheel which, together with the axle, forms the axis in peritrochio, which see under Axis.

Having the axis of the seed perpendicular to the axis of the pericarp to which it is attached.

ch a wheel having its leaves formed of the substance of the arbor or spindle which is its axis. Lantern pinion. See under Lantern. -- Pinion wire, wire fluted longitudinally, for making the pinions of clocks and watches. It is formed by being drawn through holes of the shape required for the leaves or teeth of the pin…

The length, measured along the axis, of a complete turn of the thread of a screw, or of the helical lines of the blades of a screw propeller.

A fixed pin or short axis, on the end of which a wheel or other body turns.