Definitions

from The Century Dictionary.

  • noun A simple instrument for measuring and indicating angles, sometimes used as a substitute for the theodolite.

from the GNU version of the Collaborative International Dictionary of English.

  • noun An instrument for measuring angles, in surveying, etc. It resembles a protractor, but has an alidade, sights, and a compass.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A semicircle.
  • noun An instrument for measuring angles in surveying etc., resembling a protractor with an alidade, sights, and compass.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

demi- +‎ circle. Compare French demi-cercle.

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Examples

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