| angular momentum | <physics> Momentum involved in the rotation of a body about an axis, conserved as is ordinary momentum (see momentum). Angular momentum is defined as the cross product of ordinary momentum with the position vector running from the axis of rotation to the body whose angular momentum is being determined. Torque is the rate of change of angular momentum with time. (12 Nov 1997) |
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| magnetic moment | <physics> (a) A vector associated with a magnet, current loop, or particle, the cross product of this vector with the magnetic field is equal to the torque which the field exerts on the system. (b) The adiabatic invariant associated with the rapid gyromotion of a charged particle in a slowly varying magnetic field. (The value of the magnetic moment in sense (b) is the magnitude of the vector in sense (a).) (13 Nov 1997) |
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| moment | 1. A minute portion of time; a point of time; an instant; as, at thet very moment. "In a moment, in the twinkling of an eye." (1 Cor. Xv. 52) 2. Impulsive power; force; momentum. "The moments or quantities of motion in bodies." (Berkley) "Touch, with lightest moment of impulse, His free will." (Milton) 3. Importance, as in influence or effect; consequence; weight or value; consideration. "Matters of great moment." (Shak) "It is an abstruse speculation, but also of far less moment and consequence of us than the others." (Bentley) 4. An essential element; a deciding point, fact, or consideration; an essential or influential circumstance. 5. <mathematics> An infinitesimal change in a varying quantity; an increment or decrement. 6. <mechanics> Tendency, or measure of tendency, to produce motion, especially. Motion about a fixed point or axis. Moment of a couple, the product of the intensity of the force into the perpendicular distance from the point to the line of direction of the force, the product of that component of the force which is perpendicular to the plane passing through the line and the point of application of the force, into the shortest distance between the line and this point, the product of the force into the perpendicular distance of its point of application from the plane. Moment of inertia, of a rotating body, the sum of the mass of each particle of matter of the body into the square of its distance from the axis of rotation; called also moment of rotation and moment of the mass. Statical moment, the product of a force into its leverage; the same as moment of a force with respect to a point, line, etc. Virtual moment. See Virtual. Synonym: Instant, twinkling, consequence, weight, force, value, consideration, signification, avail. Origin: F. Moment, L. Momentum, for movimentum movement, motion, moment, fr. Movere to move. See Move, and cf. Momentum, Movement. Source: Websters Dictionary (01 Mar 1998) |
| product-moment correlation | A statistical procedure which yields the correlation coefficient referred to as r (-1.00 to +1.00) and involves the actual values, rather than the ranks (rank order) of the measurements. (05 Mar 2000) |
| overturning moment | <radiobiology> Torque (moment) on a toroidal field coil in a tokamak, about the device's radial direction, that results from out-of-plane forces on the coil due to the interactions between the coil current and the poloidal (vertical) magnetic field. This torque tends to overturn the vertical toroidal field coil, and must be engineered against. (09 Oct 1997) |
| angular | 1. Relating to an angle or to angles; having an angle or angles; forming an angle or corner; sharp-cornered; pointed; as, an angular figure. 2. Measured by an angle; as, angular distance. 3. Lean; lank; raw-boned; ungraceful; sharp and stiff in character; as, remarkably angular in his habits and appearance; an angular female. Angular aperture, Angular distance. See Aperture, Distance. Angular motion, the motion of a body about a fixed point or fixed axis, as of a planet or pendulum. It is equal to the angle passed over at the point or axis by a line drawn to the body. Angular point, the point at which the sides of the angle meet; the vertex. Angular velocity, the ratio of anuglar motion to the time employed in describing. Origin: L. Angularis, fr. Angulus angle, corner. See Angle. <anatomy> A bone in the base of the lower jaw of many birds, reptiles, and fishes. Source: Websters Dictionary (01 Mar 1998) |
| angular acceleration | The rate of change of angular velocity; e.g., when a centrifuge rotor is speeding up, or when there is a simultaneous change in velocity and direction, as in an aircraft in a tight spin. (05 Mar 2000) |
| angular aldehyde | The aldehyde group attached to carbon 13 (between rings C and D) of the steroid nucleus in aldosterone. (05 Mar 2000) |
| angular aperture | The angle, in air, of light that passes from the object to the ends of the diameter of the front lens of the microscope objective. (05 Mar 2000) |
| angular artery | <anatomy, artery> The terminal branch of the facial artery; distribution, muscles and skin of side of nose; anastomoses, lateral nasal, and dorsal artery of nose and palpebrals from the ophthalmic artery, thereby providing an external-internal carotid arterial anastomosis. Synonym: artery of angular gyrus. Synonym: arteria angularis. (05 Mar 2000) |
| angular cheilitis | Inflammation and fissuring radiating from the commissures of the mouth secondary to predisposing factors such as lost vertical dimension in denture wearers, nutritional deficiencies, atopic dermatitis, or Candida albicans infection. Synonym: angular stomatitis, commissural cheilitis, perleche. (05 Mar 2000) |
| angular conjunctivitis | A subacute bilateral conjunctival inflammation sometimes caused by the Moraxella bacillus, marked by redness of the lateral canthi and scanty, stringy discharge that adheres to the lashes. Synonym: Moraxella conjunctivitis. (05 Mar 2000) |
| angular convolution | angular gyrus |
| angular curvature | A gibbous deformity, i.e., a sharp angulation of the spine, occurring in Pott's disease. Synonym: Pott's curvature. (05 Mar 2000) |
| angular methyl | A methyl group attached to carbon 10 (between rings A and B) or to carbon 13 (between rings C and D) of the steroid nucleus. (05 Mar 2000) |
| angular notch | A sharp angular depression in the lesser curvature of the stomach at the junction of the body with the pyloric canal. Synonym: incisura angularis, sulcus angularis. (05 Mar 2000) |