alidade
ali·dade
noun
1.
surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments
Origin
From French alidade, from Spanish alidada, from Arabic العِضَادَة (al-ʕiḍāda), perhaps from عَضُد (ʕaḍud, “upper arm”).
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Broader terms
Parts
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.