Adjacent Words

Axis definitions

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Webster's 1828 Dictionary

AX'IS, n. plu. axes. [L.; Gr.]
1. The straight line, real or imaginary, passing through a body, or which it revolves, or may revolve; as the axis of the earth.
2. In geometry, a straight line in a plain figure, about which it revolves to produce a solid.
3. In conic sections, a right line dividing the section into two equal parts, and cutting all its ordinates at right angles.
4. In mechanics, the axis of a balance is that line about which it moves, or rather turns.
The axis of oscillation is a right line parallel to the horizon passing through the center, about which a pendulum vibrates.
The axis in peritrochio is a wheel concentric with the base of a cylinder, and movable with it about its axis.
5. In optics, a particular ray of light from any object which falls perpendicularly on the eye.
6. In architecture, spiral axis is the axis of a twisted column spirally drawn in order to trace the circumvolutions without.
Aris of the Ionic capital is a line passing perpendicularly through the middle of the eye of the volute.
The axis of a vessel is an imaginary line passing through the middle of it, perpendicular to its base, and equally distant from its sides.
In botany, axis is a taper column in the center of some flowers or catkins, about which the other parts are disposed.
In anatomy, axis is the name of the second verteber of the neck; it has a tooth which enters into the first verteber, and this tooth is by some called the axis.

WordNet (r) 3.0 (2005)

n
1: a straight line through a body or figure that satisfies certain conditions
2: the main stem or central part about which plant organs or plant parts such as branches are arranged
3: in World War II the alliance of Germany and Italy in 1936 which later included Japan and other nations; "the Axis opposed the Allies in World War II"
4: a group of countries in special alliance [syn: bloc, axis]
5: the 2nd cervical vertebra; serves as a pivot for turning the head [syn: axis, axis vertebra]
6: the center around which something rotates [syn: axis, axis of rotation]

Merriam Webster's

noun (plural axes) Etymology: Latin, axis, axle; akin to Old English eax axis, axle, Greek ax?n, Lithuanian ašis, Sanskrit ak?a? Date: 14th century 1. a. a straight line about which a body or a geometric figure rotates or may be supposed to rotate b. a straight line with respect to which a body or figure is symmetrical — called also axis of symmetry c. a straight line that bisects at right angles a system of parallel chords of a curve and divides the curve into two symmetrical parts d. one of the reference lines of a coordinate system 2. a. the second vertebra of the neck on which the head and first vertebra turn as on a pivot b. any of various central, fundamental, or axial parts 3. a plant stem 4. one of several imaginary lines assumed in describing the positions of the planes by which a crystal is bounded and the positions of atoms in the structure of the crystal 5. a main line of direction, motion, growth, or extension 6. a. an implied line in painting or sculpture through a composition to which elements in the composition are referred b. a line actually drawn and used as the basis of measurements in an architectural or other working drawing 7. any of three fixed lines of reference in an aircraft that run in the longitudinal, lateral, and vertical directions, are mutually perpendicular, and usually pass through the aircraft's center of gravity 8. partnership, alliance 9. a point or continuum on which something centers <an axis of social power>

Merriam Webster's

adjective Date: 1938 of or relating to the three powers Germany, Italy, and Japan engaged against the Allied nations in World War II

Oxford Reference Dictionary

1. n. (pl. axes) 1 a an imaginary line about which a body rotates or about which a plane figure is conceived as generating a solid. b a line which divides a regular figure symmetrically. 2 Math. a fixed reference line for the measurement of coordinates etc. 3 Bot. the central column of an inflorescence or other growth. 4 Anat. the second cervical vertebra. 5 Physiol. the central part of an organ or organism. 6 a an agreement or alliance between two or more countries forming a centre for an eventual larger grouping of nations sharing an ideal or objective. b (the Axis) the alliance of Germany and Italy formed before and during the war of 1939-45, later extended to include Japan and other countries; these countries as a group. Etymology: L, = axle, pivot 2. n. a white spotted deer, Cervus axis, of S. Asia. Also called CHITAL. Etymology: L

Webster's 1913 Dictionary

Axis Ax"is, n. [L.] (Zo["o]l.) The spotted deer (Cervus axis or Axis maculata) of India, where it is called hog deer and parrah (Moorish name).

Webster's 1913 Dictionary

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. 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. 3. (Bot.) The stem; the central part, or longitudinal support, on which organs or parts are arranged; the central line of any body. --Gray. 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. 5. (Crystallog.) One of several imaginary lines, assumed in describing the position of the planes by which a crystal is bounded. 6. (Fine Arts) The primary or secondary central line of any design. 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 telescope or microscope, 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.

Collin's Cobuild Dictionary

(axes) 1. An axis is an imaginary line through the middle of something. N-COUNT 2. An axis of a graph is one of the two lines on which the scales of measurement are marked. N-COUNT

Soule's Dictionary of English Synonyms

n. 1. Shaft, spindle, arbor. 2. Central line, line of symmetry, line of rotation, line of revolution.

Moby Thesaurus

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