protractor

Noun

1. One who, or that which, protracts, or causes protraction.
2. A circular or semicircular tool for drawing or measuring angles.
   • Use a protractor to measure the angle accurately.
   • The student forgot to bring her protractor to geometry class.
   • plastic protractor
3. An instrument formerly used in extracting foreign or offensive matter from a wound.
4. A muscle that extends an organ or part; opposed to retractor.
5. An adjustable pattern used by tailors.