protractor
noun/pɹəˈtɹæktə(ɹ)/
Etymology From protract + -or.
1
One who, or that which, protracts, or causes protraction.
2
A circular or semicircular tool for drawing or measuring angles.
- Use a protractor to measure the angle accurately.
- The student forgot to bring her protractor to geometry class.
2 more examples
- plastic protractor
- measure with a protractor
5
An adjustable pattern used by tailors.
- Synonyms
- semicircle
- Hypernyms
- goniometer, angle measurer