Definitions for: Alidade

[n] surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles
[n] surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments

Webster (1913) Definition: Al"i*dade, n. [LL. alidada, alhidada, fr. Ar.
al-'id[=a]da 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.

Synonyms: alidad

See Also: surveying instrument, surveyor's instrument, theodolite, transit

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