(1):
(n.) One who, or that which, protracts, or causes protraction.
(2):
(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.
(3):
(n.) An instrument formerly used in extracting foreign or offensive matter from a wound.
(4):
(n.) A muscle which extends an organ or part; - opposed to retractor.
(5):
(n.) An adjustable pattern used by tailors.