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alidade
Definitions
[ˈalɪdeɪd], (Noun)
Definitions:
- a sighting device or pointer for determining directions or measuring angles, used in surveying and (formerly) astronomy
Phrases:
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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definition by Oxford Dictionaries