A Scottish and Northern English dialect word for a river or watercourse.
From Old Norse 'á' meaning water or river, related to 'aur' (stream); this word survives in Scottish place names and dialect speech from Old Norse settlement patterns.
Place names like 'River Ayr' in Scotland actually contain a redundancy—'Ayr' comes from the Norse word for river, so 'River Ayr' literally means 'river river'—the same phenomenon appears across Britain where Norse and Celtic layers overlap.
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