the line such that tangents drawn from any point of the line to two given circles are equal in length.
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Origin of radical axis
First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for radical axis
a line from any point of which tangents to two given circles are of equal length. It is the line joining the points of intersection of two circles
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