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Definition of: alidade
(al′i·dād) noun
1. An auxiliary circle, frame, or movable arm, carrying microscopes or verniers, for reading the divisions of a graduated circle or arc.
2. A theodolite having such an arm. Also al·i·dad (al′i·dad). [<F <Med.L. alhidada < Arabic al-‘idādah the revolving radius of a graduated circle]
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