Webster's Revised Unabridged Dictionary · 1913

Isle

Isle , noun

[Obs.]

See Aisle.

Isle , noun

[Old French isle, French île, Latin insula; compare Lithuanian sala. Compare Insulate.]

1.
An island. [Poetic]
Imperial rule of all the seagirt isles. — Milton
2.
(Zoology) A spot within another of a different color, as upon the wings of some insects.

Isle , transitive verb

To cause to become an island, or like an island; to surround or encompass; to island. [Poetic]
Isled in sudden seas of light. — Tennyson