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A semicircular protractor.
A circular protractor.


protractor (plural protractors)

  1. One who, or that which, protracts, or causes protraction.
  2. A circular or semicircular tool for drawing or measuring angles.
  3. (surgery) An instrument formerly used in extracting foreign or offensive matter from a wound.
  4. (anatomy) A muscle that extends an organ or part; opposed to retractor.
  5. An adjustable pattern used by tailors.
    (Can we find and add a quotation of Knight to this entry?)