protractor
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A semicircular protractor. 
A circular protractor.
English
Etymology
Pronunciation
Noun
protractor (plural protractors)
- One who, or that which, protracts, or causes protraction.
- A circular or semicircular tool for drawing or measuring angles.
- (surgery) An instrument formerly used in extracting foreign or offensive matter from a wound.
- (anatomy) A muscle that extends an organ or part; opposed to retractor.
- An adjustable pattern used by tailors.
Synonyms
- (measuring tool): semicircle (for semicircular shape)
Hypernyms
Translations
a circular or semicircular tool for measuring angles
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References
- ^ Edward H[enry] Knight (1877) “Protractor”, in Knight’s American Mechanical Dictionary. , volumes II (GAS–REA), New York, N.Y.: Hurd and Houghton , →OCLC.