Here you will find one or more explanations in English for the word Demicircle.
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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.
Meaning of Demicircle from wikipedia
