straightedge

 : 
Noun
 : 
straight=edge

WORDNET DICTIONARY

Noun straightedge has 1 sense

CIDE DICTIONARY

straightedgen. 
     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.  [1913 Webster]

For further exploring for "straightedge" in Webster Dictionary Online


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