Al″i‐dade (�), n. [LL. alidada, alhidada, fr. Ar. al-'idāda a sort of rule: cf. F. alidade.] 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 Whewell.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.