• WordNet 3.6
    • n straightedge hand tool consisting of a flat rigid rectangular bar (metal or wood) that can be used to draw straight lines (or test their straightness)
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Webster's Revised Unabridged Dictionary
    • n Straightedge 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.
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Century Dictionary and Cyclopedia
    • n straightedge A bar having one edge, at least, as straight as possible, to be used as a fiducial line in drawing and testing straight lines. Such instruments wheu of the greatest accuracy are somewhat costly. Common straight-edges for ruling ordinary lines, testing the surface of millstones, brickwork and stouework, etc., are made of wood, and range from a slip of wood one foot long to planks cut in the form of a truss and teu or more feet in length. See cut under plumb-rule.
    • n straightedge A wooden board or metal strip, with an edge accurately planed, used in irrigation for laying out ditches in connection with a level or plumb-bob and in place of a surveyor's level.
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In literature:

Remove the straightedge and slide the piece that is between the braces along until it projects 4 or 5 in.
"Mission Furniture" by H. H. Windsor
The approximate bisection (or any other division) of an angle may of course be effected by the help of the protractor and a straightedge.
"The Teaching of Geometry" by David Eugene Smith
The first requisite for this is a straightedge of iron or brass, as true as possible.
"The Invention of Lithography" by Alois Senefelder

In news:

These squares also make great straightedge guides for circular saw s, perfect for cutting studs and other smallish lumber to length.
Mark the point where your router base will ride against the straightedge.
Whenever I have to cut down a sheet of plywood I reach for one of my trusty metal stud straightedges.
This past weekend, 20 years after their split, straightedge hardcore legends Chain of Strength reunited for a pair of shows at the Revelation Records 25th anniversary bash on the east coast.
A small section of 1/8-inch angle iron was clamped in place to act as a straightedge guide for the plasma cutter.
Roger Cook replies: Two inches is a lot for a brick patio to sink , but if that's what's going on, the dip will be obvious when you lay a 4-foot level or metal straightedge across the area.
4 Set framing square and straightedge to height of riser and width of stair tread.
Use a utility knife and a straightedge to make narrow pairs of slits perpendicular to the fold and about 1/8 inch apart.
(When leveling an accessory table to a tool, clamp the straightedges to the tool's table .).
Clamp the straightedges along the front and back of the extension table or top, as shown in the photo, top.