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alidade n. 指方规,照准仪 指方规,照准仪 alidade n 1: surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments [synonym: {alidade}, {alidad}] 2: surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles [synonym: {alidade}, {alidad}] 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]
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