Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of alidade is as below...

Alidade :: Alidade (n.) The portion of a graduated instrument, as a quadrant or astrolabe, carrying the sights or telescope, and showing the degrees cut off on the arc of the instrument.

Demicircle :: Demicircle (n.) An instrument for measuring angles, in surveying, etc. It resembles a protractor, but has an alidade, sights, and a compass..

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