Small islands, especially those found in rivers or near coastlines.
From Old English 'igyth' or Old Norse 'eyja', meaning island; the word appears in English place names and survives in Scottish and Northern English dialects.
Many famous 'aits' appear in English rivers like the Thames—they're small enough that you might not think of them as 'real' islands, but they're vital ecosystems and have shaped river navigation and settlement patterns for centuries.
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