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radial motion

[ rey-dee-uhl moh-shuhn ]
/ ˈreɪ di əl ˈmoʊ ʃən /
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noun Astronomy.

the component of the motion of a star away from or toward the earth along its line of sight, expressed in miles or kilometers per second and determined by the shift in the wavelength of light emitted by the star.

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Also called ra·di·al ve·loc·i·ty [rey-dee-uhl vuh-los-i-tee] /ˈreɪ di əl vəˈlɒs ɪ ti/ .

Origin of radial motion

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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