What does "isle" mean?

Isle: An island. [Poetic] Imperial rule of all the seagirt isles. Milton.

Additional senses

  1. 2.(Zoöl.) A spot within another of a different color, as upon the wings of some insects.
  2. 3.To cause to become an island, or like an island; to surround or encompass; to island. [Poetic] Isled in sudden seas of light. Tennyson.

Sources