protractor
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About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.pro·trac·tor
noun \-ˈtrak-tər\Definition of PROTRACTOR
1
a : one that protracts b : a muscle that extends a part
2
: an instrument for laying down and measuring angles in drawing and plotting
See First Known Use of PROTRACTOR
circa 1611
Rhymes with PROTRACTOR
pro·trac·tor
noun \-tər\ (Medical Dictionary)Medical Definition of PROTRACTOR
: a muscle that extends a part—compare retractor b
protractor
noun (Concise Encyclopedia)Instrument for constructing and measuring plane angles. The simplest protractor is a semicircular disk marked in degrees from 0° to 180°. A more complex protractor, for plotting position on navigation charts, is called a three-arm protractor, or station pointer, and consists of a circular scale connected to three arms. The centre arm is fixed, while the outer two can be rotated to any desired angle relative to the centre one. A related instrument is the course protractor, which allows navigators to measure the angular distance between north and the course plotted on a navigation chart.
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