Dictionary
4 ENTRIES FOUND:

protractor

noun pro·trac·tor \-ˈtrak-tər\

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

Full 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

First Known Use of PROTRACTOR

circa 1611

protractor

noun pro·trac·tor \-tər\   (Medical Dictionary)

Medical Definition of PROTRACTOR

:  a muscle that extends a part—compare retractor b

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