the line such that tangents drawn from any point of the line to two given circles are equal in length.
Origin of radical axis
First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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