Definition for set square - Oxford Dictionaries Online (World English)

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	set square (set square) noun British a right-angled triangular plate for drawing lines, especially at 90°, 45°, 60°, or 30°. a form of T-square with an additional arm turning on a pivot for drawing lines at fixed angles to the head.		More words in this category cardioid construct directrix dodecagon eccentric ellipsoid great circle hemicylindrical midpoint non-Euclidean non-linear octagon parallelepiped pole 2 rectify section stereography subtend transversal triangular Nearby Words set list set menu set phrase set piece set play set point set screw set scrum set shot set square set theory set-aside set-in set-net set-off set-to set-top box set-up seta