protractornoun [ C ]
uk/prəˈtræk.tər/us/prəˈtræk.tɚ/a device used for measuring and drawing angles. It is usually in the form of half a circle made from transparent plastic with degrees printed on it.
Thesaurus: synonyms and related words
Geometrical & mathematical instruments
- compass
- dividers
- planimeter
- set square
- square
- T-square
- triangle