Protractor

Protractor Pro*tract"or, n. 1. One who, or that which, protracts, or causes protraction. [1913 Webster]

2. A mathematical instrument for laying down and measuring angles on paper, used in drawing or in plotting. It is of various forms, semicircular, rectangular, or circular. [1913 Webster]

3. (Surg.) An instrument formerly used in extracting foreign or offensive matter from a wound. [1913 Webster]

4. (Anat.) A muscle which extends an organ or part; -- opposed to {retractor}. [1913 Webster]

5. An adjustable pattern used by tailors. --Knight. [1913 Webster]