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alhidada

alhidada [Ar. al-‘iḍāda] , ‘alidade’, sightingrod. 1326 hallidada est virgula longa ‥ mota super paxillum motu elevacionis et depressionis ut per foramina in ejus tabellis altitudo syderum discernatur Wallingf. Rect. 343 (cf. ib. 346: allidada); a1350 tercia pars instrumenti est allidada quadrangula fortis et eque spissa; et dicitur allidada zodiaci sive turnus proprie Turquet 371.

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