Definition of alidade
: a rule equipped with simple or telescopic sights and used for determination of direction: such asa : a part of an astrolabeb : 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
First Known Use: 15th century
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Britannica.com: Encyclopedia article about alidade
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