demicircle
nounUK [dɛmɪˈsɜːkəɫ]
Etymology From demi- + circle. Compare French demi-cercle.
1
A semicircle.
2
An instrument for measuring angles in surveying etc., resembling a protractor with an alidade, sights, and compass.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.