Definition of protractor in English:
1An instrument for measuring angles, typically in the form of a flat semicircle marked with degrees along the curved edge.
- Do you need a protractor to measure their angles?
- The angle of pinnation was found by placing a protractor along the central tendon and measuring the angle of an individual fiber to the nearest 0.5 degree.
- A protractor was used to measure the angle of this line to the transverse line and hence the angle to the apex of the nucellus.
2 (also protractor muscle) chiefly Zoology A muscle serving to extend a part of the body. Compare with retractor.
- They accomplish this coordination with proprioceptive feedback through the hypoglossal nerve that disinhibits activation of the jaw depressors when the tongue protractor muscle is activated.
- Two pairs of epibranchials are present in adults, one bony and one cartilaginous, compared to a single pair in most other families, and the protractor muscle encompasses both epibranchials.
- In the overhead thrower, the shoulder external rotator muscles, scapular retractor muscles, and protractor and depressor muscles are frequently isolated because of weakness.
Definition of protractor in:
- British & World English dictionary