From The Collaborative International Dictionary of English v.0.44 [gcide]:
Straightedge \Straight"edge'\, noun A board, or piece of wood or metal, having one edge perfectly straight, -- used to ascertain whether a line is straight or a surface even, and for drawing straight lines.
From WordNet (r) 2.0 [wn]:
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Let's see what we can do if we put our heads together.0