alidad

Variant of alidade

noun

  1. a part of an optical or surveying instrument, consisting of the vernier, indicator, etc.
  2. a surveying instrument consisting of a telescope mounted on a rule, used in topography
Also alidad

Origin: Fr < Sp alidada < Ar al ʿiḍāda, two sides or sideposts < ʿaḍud, upper arm

Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
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