Hypertext Webster Gateway: "alidade"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Alidade \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.
From WordNet (r) 1.7 (wn)
alidade
n 1: surveying instrument consisting of the upper movable part of
a theodolite including the telescope and its attachments
[syn: {alidad}]
2: surveying instrument used with a plane table for drawing
lines of sight on a distant object and for measuring
angles [syn: {alidad}]
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