| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| alidade |
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| SYLLABICATION: | al·i·dade |
| PRONUNCIATION: |   l  -d d |
| VARIANT FORMS: | also al·i·dad (-dd) |
| NOUN: | 1. An indicator or a sighting apparatus on a plane table, used in angular measurement. 2. A topographic surveying and mapping instrument used for determining directions, consisting of a telescope and attached parts. | | ETYMOLOGY: | French, from Medieval Latin alidada, sighting rod, from Arabic al-‘i da, the revolving radius of a circle : al-, the + ‘ida, revolving radius (alternate form of ‘aud, humerus, from ‘aada, to lop, cut (trees); see c d in Appendix II).
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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