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alidade - 3 dictionary results
al⋅i⋅dade
[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, al⋅i⋅dad [al-i-dad] .
[al-i-dad] . Origin:
1400–50; var. of alhidade < ML alhidada < Ar al-ʿiḍādah the turning radius (like a clock hand) of a circle; r. late ME allydatha (< OSp alhidada)
1400–50; var. of alhidade < ML alhidada < Ar al-ʿiḍādah the turning radius (like a clock hand) of a circle; r. late ME allydatha (< OSp alhidada)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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Link To alidade
| al·i·dade (āl'ĭ-dād') n.
[French, from Medieval Latin alidada, sighting rod, from Arabic al-'iḍāda, the revolving radius of a circle : al-, the + 'iḍāda, revolving radius (alternate form of 'aḍud, humerus, from 'aḍada, to lop, cut (trees); see ʕ  d in Semitic roots).] |
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Alidade
Al"i*dade\, n. [LL. alidada, alhidada, fr. Ar. al-'id[=a]da a sort of rule: cf. F. alidade.] The portion of a graduated instrument, as a quadrant or astrolabe, carrying the sights or telescope, and showing the degrees cut off on the arc of the instrument --Whewell.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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