Recent Examples of straightedge from the Web
The shell of Ensis directus really does look like an old-fashioned straightedge razor, narrow and thin, or a jackknife, per its other common name, Atlantic jackknife clam.
Pro tip: use the side of your favorite palette as a straightedge for your cheekbones.
This slick straightedge was invented by Anirudh Sharma, Lirong Liu, and Professor Pattie Maes in the Fluid Interfaces group at MIT’s Media Lab.
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STRAIGHTEDGE Defined for English Language Learners
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