protractor (n.) One who, or that which, protracts, or causes
protraction.
protractor (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.
protractor (n.) An instrument formerly used in extracting foreign or
offensive matter from a wound.
protractor (n.) A muscle which extends an organ or part; -- opposed to
retractor.
protractor (n.) An adjustable pattern used by tailors.
Wikipedia
A protractor is a tool used to measure angles in degrees. It usually has a curved top and a flat bottom shape and has marks with labels of the degrees.
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