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  • WordNet 3.6
    • n protractor drafting instrument used to draw or measure angles
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Webster's Revised Unabridged Dictionary
    • Protractor A mathematical instrument for laying down and measuring angles on paper, used in drawing or in plotting. It is of various forms, semicircular, rectangular, or circular.
    • Protractor (Anat) A muscle which extends an organ or part; -- opposed to retractor.
    • Protractor An adjustable pattern used by tailors.
    • Protractor (Surg) An instrument formerly used in extracting foreign or offensive matter from a wound.
    • Protractor One who, or that which, protracts, or causes protraction.
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Century Dictionary and Cyclopedia
    • n protractor One who or that which protracts. As applied to persons, also protractor. Specifically — In surveying, an instrument for laying down and measuring angles on paper. It is of various forms semicircular, rectangular, or circular. See also cut under bevel-protractor.
    • n protractor In anatomy, a muscle which protracts, or extends or draws a part forward: the opposite of retractor. See diagram under Echinoidea.
    • n protractor An adjustable pattern, agreeing in proportion with particular measurements, used by tailors in cutting out garments.
    • ***
Chambers's Twentieth Century Dictionary
    • n Protractor one who, or that which, protracts: a mathematical instrument for laying down angles on paper, used in surveying, &c
    • ***


Chambers's Twentieth Century Dictionary
L.,—pro, forth, trahĕre, to draw.


In literature:

For small objects he used a pair of compasses and an ivory protractor.
"The Life and Letters of Charles Darwin, Volume I (of II)" by Charles Darwin
One six-inch semicircular protractor, with Vernier: 3 pounds 3 shillings.
"Successful Exploration Through the Interior of Australia" by William John Wills
He looked up at her and nodded pleasantly, then moved his protractor a few inches.
"The Leopard Woman" by Stewart Edward White
Now we will place the base edge of our protractor on the base line with its center at the right hand end of the line.
"The Scientific American Boy" by A. Russell (Alexander Russell) Bond
Well, there's the protractor, and there's the coconut ice.
"The Judge" by Rebecca West
A semicircular protractor of metal for measuring the inclination of vents, or for ascertaining their deviation from the guide.
"Ordnance Instructions for the United States Navy." by Bureau of Ordnance, USN
Place the center of the protractor at B and draw the angle of width of pallets of 6deg.
"An Analysis of the Lever Escapement" by H. R. Playtner
Universal bevel protractor 20 14.
"Practical Mechanics for Boys" by J. S. Zerbe
He was using a protractor, which was divided into Galactic degrees.
"The Players" by Everett B. Cole
Set a bevel protractor at a 45-deg.
"Mission Furniture" by H. H. Windsor
For measuring the slopes of letters a transparent protractor is necessary.
"The Detection of Forgery" by Douglas Blackburn
The protractor is an instrument used to shape long courses.
"Lectures in Navigation" by Ernest Gallaudet Draper
Carry the protractor farther away from the window and repeat the experiment, to see how much the angle changes.
"A Text-Book of Astronomy" by George C. Comstock
It is also fairly accurate to run a line at any angle to a given line by sighting along two pins stuck in a protractor.
"The Teaching of Geometry" by David Eugene Smith
He also made another protractor for attaching to the end of a ruler for measuring distances on charts.
"Early American Scientific Instruments and Their Makers" by Silvio A. Bedini

In news:

Bonus points for the repeated use of a protractor.
Not gonna lie to y'all, I was very excited to see what Protractor Ted were getting on about.
During use, the top protractor 's zero line indicates the angle on the bottom protractor 's scale.
She simply fastened two see-through plastic protractors on top of one another.
Start with a pair of identical protractors from an office supply store (about $1 each).
Steven Q Protractor 's profile.
I go with these two approaches because an ordinary "school" type protractor is too small to give me the degree of accuracy I want when setting blade angles with a bevel gauge.
Tools/Machines New Products Digital precision protractor.
DIGITAL PRECISION PROTRACTOR, from General Tools and Instruments, displays absolute and relative angle measurements in a LCD window.
Remember Adam Sandler's old "crazy protractor face" skit.
A large protractor scale at the end of the fence lets you precisely tune angles for air-tight miters and crosscuts – no more squinting.
Clockwise, from top: Mahogany level with vial covers, level with protractor, rosewood level and plumb bob, rosewood pocket level, mahogany level with top and butt plates, cherry level.
Need a red plastic protractor, Japanese greeting cards, designer photo albums, or vivid erasers in the shape of sushi rolls.
I lay the protractors right on the glass of the Xerox machine and copy them onto the transparency film.