Axes of coordinates in a plane
Axis Ax"is, n.; pl. {Axes}. [L. axis axis, axle. See {Axle}.] A straight line, real or imaginary, passing through a body, on which it revolves, or may be supposed to revolve; a line passing through a body or system around which the parts are symmetrically arranged. [1913 Webster]

2. (Math.) A straight line with respect to which the different parts of a magnitude are symmetrically arranged; as, the axis of a cylinder, i. e., the axis of a cone, that is, the straight line joining the vertex and the center of the base; the axis of a circle, any straight line passing through the center. [1913 Webster]

3. (Bot.) The stem; the central part, or longitudinal support, on which organs or parts are arranged; the central line of any body. --Gray. [1913 Webster]

4. (Anat.) (a) The second vertebra of the neck, or {vertebra dentata}. (b) Also used of the body only of the vertebra, which is prolonged anteriorly within the foramen of the first vertebra or atlas, so as to form the odontoid process or peg which serves as a pivot for the atlas and head to turn upon. [1913 Webster]

5. (Crystallog.) One of several imaginary lines, assumed in describing the position of the planes by which a crystal is bounded. [1913 Webster]

6. (Fine Arts) The primary or secondary central line of any design. [1913 Webster]

{Anticlinal axis} (Geol.), a line or ridge from which the strata slope downward on the two opposite sides.

{Synclinal axis}, a line from which the strata slope upward in opposite directions, so as to form a valley.

{Axis cylinder} (Anat.), the neuraxis or essential, central substance of a nerve fiber; -- called also {axis band}, {axial fiber}, and {cylinder axis}.

{Axis in peritrochio}, the wheel and axle, one of the mechanical powers.

{Axis of a curve} (Geom.), a straight line which bisects a system of parallel chords of a curve; called a {principal axis}, when cutting them at right angles, in which case it divides the curve into two symmetrical portions, as in the parabola, which has one such axis, the ellipse, which has two, or the circle, which has an infinite number. The two axes of the ellipse are the {major axis} and the {minor axis}, and the two axes of the hyperbola are the {transverse axis} and the {conjugate axis}.

{Axis of a lens}, the straight line passing through its center and perpendicular to its surfaces.

{Axis of a microscope} or {Axis of a telescope}, the straight line with which coincide the axes of the several lenses which compose it.

{Axes of co["o]rdinates in a plane}, two straight lines intersecting each other, to which points are referred for the purpose of determining their relative position: they are either rectangular or oblique.

{Axes of co["o]rdinates in space}, the three straight lines in which the co["o]rdinate planes intersect each other.

{Axis of a balance}, that line about which it turns.

{Axis of oscillation}, of a pendulum, a right line passing through the center about which it vibrates, and perpendicular to the plane of vibration.

{Axis of polarization}, the central line around which the prismatic rings or curves are arranged. --Brewster.

{Axis of revolution} (Descriptive Geom.), a straight line about which some line or plane is revolved, so that the several points of the line or plane shall describe circles with their centers in the fixed line, and their planes perpendicular to it, the line describing a surface of revolution, and the plane a solid of revolution.

{Axis of symmetry} (Geom.), any line in a plane figure which divides the figure into two such parts that one part, when folded over along the axis, shall coincide with the other part.

{Axis of the} {equator, ecliptic, horizon} (or other circle considered with reference to the sphere on which it lies), the diameter of the sphere which is perpendicular to the plane of the circle. --Hutton.

{Axis of the Ionic capital} (Arch.), a line passing perpendicularly through the middle of the eye of the volute.

{Neutral axis} (Mech.), the line of demarcation between the horizontal elastic forces of tension and compression, exerted by the fibers in any cross section of a girder.

{Optic axis of a crystal}, the direction in which a ray of transmitted light suffers no double refraction. All crystals, not of the isometric system, are either uniaxial or biaxial.

{Optic axis}, {Visual axis} (Opt.), the straight line passing through the center of the pupil, and perpendicular to the surface of the eye.

{Radical axis of two circles} (Geom.), the straight line perpendicular to the line joining their centers and such that the tangents from any point of it to the two circles shall be equal to each other.

{Spiral axis} (Arch.), the axis of a twisted column drawn spirally in order to trace the circumvolutions without.

{Axis of abscissas} and {Axis of ordinates}. See {Abscissa}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Axes of coordinates in space — Axis Ax is, n.; pl. {Axes}. [L. axis axis, axle. See {Axle}.] A straight line, real or imaginary, passing through a body, on which it revolves, or may be supposed to revolve; a line passing through a body or system around which the parts are… …   The Collaborative International Dictionary of English

  • axes of coordinates — ˈakˌsēz 1. : two intersecting straight lines used as reference lines in plane Cartesian geometry 2. : the three straight lines having a common point that are the intersections of the three coordinate planes of reference in three dimensional… …   Useful english dictionary

  • Oblique system of coordinates — Oblique Ob*lique , a. [F., fr. L. obliquus; ob (see {Ob }) + liquis oblique; cf. licinus bent upward, Gr. le chrios slanting.] [Written also {oblike}.] [1913 Webster] 1. Not erect or perpendicular; neither parallel to, nor at right angles from,… …   The Collaborative International Dictionary of English

  • Problem of Apollonius — In Euclidean plane geometry, Apollonius problem is to construct circles that are tangent to three given circles in a plane (Figure 1); two circles are tangent if they touch at a single point. Apollonius of Perga (ca. 262 BC ndash; ca. 190 BC)… …   Wikipedia

  • Circles of Apollonius — Apollonian circle redirects here. For a subdivision of this subject, see Apollonian circles. The term circle of Apollonius is used to describe several types of circles associated with Apollonius of Perga, a renowned Greek geometer. Most of these… …   Wikipedia

  • Line coordinates — In geometry, line coordinates are used to specify the position of a line just as point coordinates (or simply coordinates) are used to specify the position of a point. Contents 1 Lines in the plane 2 Tangential equations 3 Tangential equation of… …   Wikipedia

  • Frame fields in general relativity — In general relativity, a frame field (also called a tetrad or vierbein) is a set of four orthonormal vector fields, one timelike and three spacelike, defined on a Lorentzian manifold that is physically interpreted as a model of spacetime. The… …   Wikipedia

  • Curvilinear coordinates — Curvilinear, affine, and Cartesian coordinates in two dimensional space Curvilinear coordinates are a coordinate system for Euclidean space in which the coordinate lines may be curved. These coordinates may be derived from a set of Cartesian… …   Wikipedia

  • Complex plane — Geometric representation of z and its conjugate in the complex plane. The distance along the light blue line from the origin to the point z is the modulus or absolute value of z. The angle φ is the argument of z. In mathematics …   Wikipedia

  • nature, philosophy of — Introduction       the discipline that investigates substantive issues regarding the actual features of nature as a reality. The discussion here is divided into two parts: the philosophy of physics and the philosophy of biology.       In this… …   Universalium

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”