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Webster 1913 Edition

Protractor

Pro-tract′or

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

Webster 1828 Edition

Protractor

PROTRACT'OR

,
Noun.
An instrument for laying down and measuring angles on paper with accuracy and dispatch, and by which the use of the line of chords is superseded. It is of various forms, semicircular, rectangular or circular.

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