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alidade

noun al·i·dade \ ˈa-lə-ˌdād \

Definition of alidade

:a rule equipped with simple or telescopic sights and used for determination of direction: such as
a :a part of an astrolabe
b :a part of a surveying instrument consisting of the telescope and its attachments

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Origin and Etymology of alidade

Middle English allidatha, from Medieval Latin alhidada, from Arabic al-ʽiḍāda the revolving radius of a circle

Learn More about alidade

  1. Britannica.com: Encyclopedia article about alidade

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