Portuguese

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Portuguese Wikipedia has an article on:
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rio Dão

Etymology

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From de + Adon, which later evolved into d'Om. Ultimately from Proto-Celtic *abonā (river), from *abū (river), from Proto-Indo-European *h₂ep- (body of water).

Pronunciation

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Proper noun

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Dão m

  1. Dão (a river in Portugal)