- a person or thing that protracts.
- (in surveying, mathematics, etc.) an instrument having a graduated arc for plotting or measuring angles.
- Anatomy. a muscle that causes a part to protrude.
Origin of protractor
Examples from the Web for protractor
Historical Examples of protractor
The protractor has a graduated disk, and is adjustable so it can be disposed at any angle.Practical Mechanics for Boys
J. S. Zerbe
He was using a protractor, which was divided into Galactic degrees.The Players
Everett B. Cole
Protractor: that which extends or lengthens out: applied to muscles.Explanation of Terms Used in Entomology
John. B. Smith
We'll start with the one with the coconut ice and the protractor, please.The Judge
At that point find, by means of a protractor, the angle a projection of the chord makes with the face of the beam.The Aeroplane Speaks
- an instrument for measuring or drawing angles on paper, usually a flat semicircular transparent plastic sheet graduated in degrees
- a person or thing that protracts
- a surgical instrument for removing a bullet from the body
- anatomy a former term for extensor
Word Origin and History for protractor
1610s, "one who lengthens (an action)," from Medieval Latin protractor, agent noun from Latin protrahere "to draw forward" (see protraction); sense of "instrument for drawing angles" first recorded 1650s.
- A muscle that extends a limb or other part.