| 单词 | alidade |
| 释义 | alidade /al"i dayd'/, n. Survey. 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'/. [1400-50; var. of alhidade < ML alhidada < Ar al-'idadah the turning radius (like a clock hand) of a circle; r. late ME allydatha ( < OSp alhidada)] |
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