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单词 alidade
释义

Definition of alidade in English:

alidade

noun ˈalɪdeɪdˈaləˌdād
  • A sighting device or pointer for determining directions or measuring angles, used in surveying and (formerly) astronomy.

    照准仪

    Example sentencesExamples
    • A wide variety of alidades and plane tables are available, both in manual and electronic versions.
    • In the circle an index on the alidades gives the angle that they form with the vertical diameter.
    • A pointer, called an alidade, was pivoted at the centre of the disk.
    • Both the alidades and the straight edges of the quadrant are fitted with viewers.
    • Telescopic alidades came into use in Europe in the early 1800s, and were soon introduced to American practice.

Origin

Late Middle English: directly or (in modern use) via French and Spanish from Arabic al-‘iḍāda 'the revolving radius', probably based on aḍud 'upper arm'.

Definition of alidade in US English:

alidade

nounˈaləˌdād
  • A sighting device or pointer for determining directions or measuring angles, used in surveying and (formerly) astronomy.

    照准仪

    Example sentencesExamples
    • In the circle an index on the alidades gives the angle that they form with the vertical diameter.
    • A wide variety of alidades and plane tables are available, both in manual and electronic versions.
    • Both the alidades and the straight edges of the quadrant are fitted with viewers.
    • A pointer, called an alidade, was pivoted at the centre of the disk.
    • Telescopic alidades came into use in Europe in the early 1800s, and were soon introduced to American practice.

Origin

Late Middle English: directly or (in modern use) via French and Spanish from Arabic al-‘iḍāda ‘the revolving radius’, probably based on aḍud ‘upper arm’.

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更新时间:2024/12/25 13:02:20