Alidade
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The portion of a graduated instrument, as a quadrant orastrolabe, carrying the sights or telescope, and showing the degreescut off on the arc of the instrument Whewell.
Alidade meaning & definition 1 of Alidade.
The portion of a graduated instrument, as a quadrant orastrolabe, carrying the sights or telescope, and showing the degreescut off on the arc of the instrument Whewell.