follow Dictionary.com

Do you know ghouls from goblins and ghosts?

radial motion

noun, Astronomy
1.
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.
Also called radial velocity.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for radial velocity

radial velocity

noun
1.
the component of the velocity of an object, esp a celestial body, directed along a line from the observer to the object
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Contemporary definitions for radial velocity
noun

the speed an object moves toward or away from an observer, specif. that of a star or other celestial body along the line of sight of an observer

Dictionary.com's 21st Century Lexicon
Copyright © 2003-2014 Dictionary.com, LLC
Cite This Source

Word of the Day

Difficulty index for radial motion

Few English speakers likely know this word

Word Value for radial

7
8
Scrabble Words With Friends