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Dictionary

tangen'tial mo'tion

Astron.
the component of the linear motion of a star with respect to the sun, measured along a line perpendicular to its line of sight and expressed in miles or kilometers per second. Also called tangen'tial veloc'ity. Cf. proper motion, radial motion.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

tangential

tangerine

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