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单词 alidade
释义
al·i·dade (ălĭ-dād) also al·i·dad (-dăd)
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-'iāda, the revolving radius of a circle : al-, the + 'iāda, revolving radius (alternate form of 'aud, humerus, from 'aada, to lop, cut (trees); see ʿd in the Appendix of Semitic roots).]
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更新时间:2025/3/22 10:29:19