Crossword Genius

Straight line joining two non-adjacent corners of a polygon (8)

Ross

I believe the answer is:

diagonal

(Other definitions for diagonal that I've seen before include "Straight line on a slant" , "Line from one corner to the fartherst one" , "straight line from corner" , "On a slope" , "Corner-to-corner line" .)

I've seen this clue in The Irish Times.
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