Definition of protractor

• n. - One who, or that which, protracts, or causes protraction.
• n. - 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.
• n. - An instrument formerly used in extracting foreign or offensive matter from a wound.
• n. - A muscle which extends an organ or part; -- opposed to retractor.
• n. - An adjustable pattern used by tailors.