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Noun: alidad  'a-li,dad
  1. Surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments
    - alidade
  2. Surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles
    - alidade

Derived forms: alidads

Type of: surveying instrument, surveyor's instrument

Part of: theodolite, transit

Encyclopedia: Alidad, Lorestan