| 单词 | alidade |
| 释义 | Word Frequency alidade(ˈælɪˌdeɪd) or alidad (ˈælɪˌdæd) noun 1. a surveying instrument used in plane-tabling for drawing lines of sight on a distant object and taking angular measurements 2. the upper rotatable part of a theodolite, including the telescope and its attachments Word origin C15: from French, from Medieval Latin allidada, from Arabic al-'idāda the revolving radius of a circle |
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