alidade

  1. Noun.  a sighting device used for measuring angles.
  2. Noun.  a surveying instrument used on a horizontal surface for basic mapping of a limited area (see: [http://americanhistory.si.edu/collections/surveying/enlarge.cfm?recordnumber=764357| this illustration]).

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This entry was last updated on RefTopia from its source on 3/20/2012.