Demicircle

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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.
     [1913 Webster]