protractor

noun pro·trac·tor \ prō-ˈtrak-tər , prə- \
Updated on: 3 Apr 2018

Definition of protractor

1 a : one that protracts
b : a muscle that extends a part
2 : an instrument for laying down and measuring angles in drawing and plotting

Recent Examples of protractor from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'protractor.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of protractor

circa 1611


PROTRACTOR Defined for English Language Learners

protractor

Definition of protractor for English Language Learners

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


PROTRACTOR Defined for Kids

protractor

noun pro·trac·tor \ prō-ˈtrak-tər \

Definition of protractor for Students

: an instrument used for drawing and measuring angles

Medical Dictionary

protractor

noun pro·trac·tor \ -tər \

medical Definition of protractor

: a muscle that extends a part — compare retractor b


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