ALIDAD
- a device used in angular measurement, also ALIDADE [n -S]
- (in plane-tabling) a straightedge having a telescopic sight or other means of sighting parallel to the straightedge
- the entire upper part of a theodolite or transit, including the telescope, its supports, the level vials, the circle-reading device, and the spindle
- alidade (a device used in angular measurement) [n ALIDADS]