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- Velocity - n. - Quickness of motion; swiftness; speed; celerity; rapidity; as, the velocity of wind; the velocity of a planet or comet in its orbit or course; the velocity of a cannon ball; the velocity of light.
- Velocity - n. - Rate of motion; the relation of motion to time, measured by the number of units of space passed over by a moving body or point in a unit of time, usually the number of feet passed over in a second. See the Note under Speed.
- Hysteresis - n. - A lagging or retardation of the effect, when the forces acting upon a body are changed, as if from velocity or internal friction; a temporary resistance to change from a condition previously induced, observed in magnetism, thermoelectricity, etc., on reversal of polarity.
- Hydrometer - n. - An instrument, variously constructed, used for measuring the velocity or discharge of water, as in rivers, from reservoirs, etc., and called by various specific names according to its construction or use, as tachometer, rheometer, hydrometer, pendulum, etc.; a current gauge.
- Anemometry - n. - The act or process of ascertaining the force or velocity of the wind.
- Dyne - n. - The unit of force, in the C. G. S. (Centimeter Gram Second) system of physical units; that is, the force which, acting on a gram for a second, generates a velocity of a centimeter per second.
- Rheometer - n. - An instrument for measuring the velocity of the blood current in the arteries.
- Fluxion - n. - A method of analysis developed by Newton, and based on the conception of all magnitudes as generated by motion, and involving in their changes the notion of velocity or rate of change. Its results are the same as those of the differential and integral calculus, from which it differs little except in notation and logical method.
- Poundal - n. - A unit of force based upon the pound, foot, and second, being the force which, acting on a pound avoirdupois for one second, causes it to acquire by the of that time a velocity of one foot per second. It is about equal to the weight of half an ounce, and is 13,825 dynes.
- Translation - n. - Motion in which all the points of the moving body have at any instant the same velocity and direction of motion; -- opposed to rotation.
- Chronoscope - n. - An instrument for measuring minute intervals of time; used in determining the velocity of projectiles, the duration of short-lived luminous phenomena, etc.
- Hemadromometry - n. - The act of measuring the velocity with which the blood circulates in the arteries; haemotachometry.
- Haemadromograph - n. - An instrument for registering the velocity of the blood.
- Hydrometry - n. - The art or operation of measuring the velocity or discharge of running water, as in rivers, etc.
- Accelerometer - n. - An apparatus for measuring the velocity imparted by gunpowder.
- Anemometer - n. - An instrument for measuring the force or velocity of the wind; a wind gauge.
- Electro-ballistics - n. - The art or science of measuring the force or velocity of projectiles by means of electricity.
- Cyclone - n. - A violent storm, often of vast extent, characterized by high winds rotating about a calm center of low atmospheric pressure. This center moves onward, often with a velocity of twenty or thirty miles an hour.
- Tachometer - n. - An instrument for measuring the velocity of the blood; a haematachometer.
- Hydrodynamometer - n. - An instrument to measure the velocity of a liquid current by the force of its impact.
- Haematachometer - n. - A form of apparatus (somewhat different from the hemadrometer) for measuring the velocity of the blood.
- Haematachometry - n. - The measurement of the velocity of the blood.
- Hemadromometer - n. - An instrument for measuring the velocity with which the blood moves in the arteries.
- Pitot's tube - - A bent tube used to determine the velocity of running water, by placing the curved end under water, and observing the height to which the fluid rises in the tube; a kind of current meter.
- Velocity - n. - Quickness of motion; swiftness; speed; celerity; rapidity; as, the velocity of wind; the velocity of a planet or comet in its orbit or course; the velocity of a cannon ball; the velocity of light.
- Impetus - n. - The aititude through which a heavy body must fall to acquire a velocity equal to that with which a ball is discharged from a piece.
- Libration point - n. - any one of five points in the plane of a system of two large astronomical bodies orbiting each other, as the Earth-moon system, where the gravitational pull of the two bodies on an object are approximately equal, and in opposite directions. A solid object moving in the same velocity and direction as such a libration point will remain in gravitational equilibrium with the two bodies of the system and not fall toward either body.