1 alidade | Definition of alidade
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alidade

noun
al·​i·​dade | \ ˈa-lə-ˌdād How to pronounce alidade (audio) \

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

First Known Use of alidade

15th century, in the meaning defined above

History and Etymology for alidade

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

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More from Merriam-Webster on alidade

Britannica.com: Encyclopedia article about alidade

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