Found 2 items, similar to alidade.
English → English (WordNet) Definition: alidade 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]
English → English (gcide) Definition: Alidade 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. [1913 Webster]