al·i·dade ( l  -d d ) also al·i·dad (-dd)n. 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. [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   d in Semitic roots).] |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  alidad - surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachmentssurveying instrument, surveyor's instrument - an instrument used by surveyors theodolite, transit - a surveying instrument for measuring horizontal and vertical angles, consisting of a small telescope mounted on a tripod |
| 2. |  alidad - surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring anglessurveying instrument, surveyor's instrument - an instrument used by surveyors |
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