protractor

noun

A flat, usually half-circle instrument used to measure and draw angles.

Example sentence

“Use a protractor to check that the angle is exactly ninety degrees.”

A standard item in a school geometry set. Do not misread it as 'protector'; the two are unrelated in use.

Related words

backpackTo hike into remote country and camp overnight, carrying your gear in a pack on your back.compassAn instrument with a magnetized needle or electronic sensor that shows which way north is.timetableA chart listing events and the times they happen, especially the arrival and departure times of trains or buses.calculatorA machine, usually electronic, built to carry out mathematical calculations.courseworkProjects and assignments that students must complete for a course and that count toward their final grade.highlighterA pen with bright, transparent ink used to mark important parts of a text.