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| pro·trac·tor [ prō tráktər, prə tráktər ] (plural pro·trac·tors) |
noun |
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1. instrument for measuring angles: an instrument shaped like a semicircle marked with the degrees of a circle, used to measure or mark out angles
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2. somebody or something that lengthens something: somebody or something that extends or lengthens something
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3. anatomy muscle that extends body part: a muscle with the function of extending a body part
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