The Collaborative International Dictionary
Demicircle
Demicircle \Dem"i*cir`cle\, n. [Cf. F. demi-cercle.] An instrument for measuring angles, in surveying, etc. It resembles a protractor, but has an alidade, sights, and a compass.
Wiktionary
demicircle
n. 1 A semicircle. 2 An instrument for measuring angles in surveying etc., resembling a protractor with an alidade, sights, and compass.
Usage examples of "demicircle".
He could see the wave of her influence traveling outward in a demicircle through the street, a spirit of peace, sweeping through the mob.