Noun

1. An island in a river, especially the River Thames in England.
   • 1833, Johann Wolfgang von Goethe, Autobiography: Truth and Fiction Relating to My Life trans. John Oxenford, book 9,

     Striking richness of vegetation which follows in the windings of the Rhine, marks its banks, islands, and aits.

   • 1853, Charles Dickens, Bleak House, ch. 1,

     Fog everywhere. Fog up the river, where it flows among green aits and meadows.