Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

protractor

play
noun pro·trac·tor \-ˈtrak-tər\

Simple Definition of protractor

  • : a device that has the form of a half circle and that is used for drawing and measuring angles

Full Definition of protractor

  1. 1 a :  one that protracts b :  a muscle that extends a part

  2. 2 :  an instrument for laying down and measuring angles in drawing and plotting

Circa 1611

First Known Use of protractor

circa 1611


PROTRACTOR Defined for Kids

protractor

play
noun pro·trac·tor \prō-ˈtrak-tər\

Definition of protractor

  1. :  an instrument used for drawing and measuring angles




Medical Dictionary

protractor

play
noun pro·trac·tor \-tər\

Medical Definition of protractor

  1. :  a muscle that extends a part—compare retractor b




Learn More about protractor


Seen and Heard

What made you want to look up protractor? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 10, 2016

to put in good humor

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

spindrift duvet kittly-benders pince-nez
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ