| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024al•i•dade (al′i dād′),USA pronunciation n. [Survey.]- Surveying(in plane-tabling) a straightedge having a telescopic sight or other means of sighting parallel to the straightedge.
- Surveyingthe 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′).USA pronunciation - Old Spanish alhidada)
- Arabic al-‘iḍādah the turning radius (like a clock hand) of a circle; replacing late Middle English allydatha (
- Medieval Latin alhidada
- variant of alhidade 1400–50
Collins Concise English Dictionary © HarperCollins Publishers:: alidade /ˈælɪˌdeɪd/, alidad /ˈælɪˌdæd/ n - a surveying instrument used in plane-tabling for drawing lines of sight on a distant object and taking angular measurements
- the upper rotatable part of a theodolite, including the telescope and its attachments
Etymology: 15th Century: from French, from Medieval Latin allidada, from Arabic al-'idāda the revolving radius of a circle |