Words for sea in Celtic languages:

Proto-Celtic *mori = sea
Primitive Irish *ᚋᚑᚏᚔᚅ (*morin) = sea
Old Irish (Goídelc) muir = sea
Irish (Gaeilge) muir = sea
Scottish Gaelic (Gàidhlig) muir [murʲ] = sea
Manx (Gaelg) mooir = sea
Proto-Brythonic *mor = sea
Middle Welsh (Kymraec) mor = sea
Welsh (Cymraeg) môr [moːr] = sea, ocean, the deep; plenty, abundance, copiousness
Old/Middle Cornish mor = sea
Cornish (Kernewek) mor = sea
Old/Middle Breton mor = sea
Breton (Brezhoneg) mor = sea

Etymology: from the Proto-Indo-European móri (sea, standing water), from *mer- (sea, lake, wetland), which is also the root for the English word mere, as in Windermere [source].

In Welsh there is another word for sea: gweilgi, which also means ocean, the deep, flood or torrent. It comes from gwae (woe, great misery, affliction, distress, anguish, trouble, adversity) and ci (dog).

Sources: Wiktionary, Am Faclair Beag,, On-Line Manx Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau


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