| 单词 | alidads |
| 释义 | alidad /alˈi-dad or a-li-dadˈ/ or alidade /-dād/ (surveying)nounA revolving index for reading the graduations of an astrolabe, quadrant, or similar instrument, or for taking the direction of objects ORIGIN: Ar al ʻidādah the revolving radius, from ʻadid humerus |
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