| 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 Origin: LL. Alidada, alhidada, fr. Ar. Al-'idada a sort of rule: cf. F. Alidade. Source: Websters Dictionary (01 Mar 1998) |
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| alidade | surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles |
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| alidade | surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments |
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