An alternative or variant form of alidade; a sighting ruler used on surveying instruments for measuring angles and directions.
A variant spelling of 'alidade,' from Arabic 'al-idadah,' showing how the word was adapted into different European languages with slightly different spellings.
This word shows how a single Arabic term traveled differently through European languages—'alidade' in English, 'alidada' in Spanish and Portuguese, each pronunciation shaped by the language that adopted it centuries ago.
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