Alidades

alidade

[al-i-deyd]
noun Surveying.
1.
(in plane-tabling) a straightedge having a telescopic sight or other means of sighting parallel to the straightedge.
2.
the entire upper part of a theodolite or transit, including the telescope, its supports, the level vials, the circle-reading device, and the spindle.
Also, alidad [al-i-dad] .


Origin:
1400–50; variant of alhidade < Medieval Latin alhidada < Arabic al-ʿiḍādah the turning radius (like a clock hand) of a circle; replacing late Middle English allydatha (< Old Spanish alhidada)

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World English Dictionary
alidade or alidad (ˈælɪˌdeɪd, ˈælɪˌdæd)
 
n
1.  a surveying instrument used in plane-tabling for drawing lines of sight on a distant object and taking angular measurements
2.  the upper rotatable part of a theodolite, including the telescope and its attachments
 
[C15: from French, from Medieval Latin allidada, from Arabic al-'idāda the revolving radius of a circle]
 
alidad or alidad
 
n
 
[C15: from French, from Medieval Latin allidada, from Arabic al-'idāda the revolving radius of a circle]

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