Crossword Genius

Line touching a circle (7)

Ross

I believe the answer is:

tangent

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">line touching a circle</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for tangent that I've seen before include "Trig ratio" , "mostly irrelevant item" , "What people often go off at!" , "Straight line resting on a circle" , "Straight line that touches but does not intersect a curve" .)

I've seen this clue in The Times.
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