The Collaborative International Dictionary of English v.0.48:

Isle \Isle\, n. [Obs.]
   See Aisle.
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The Collaborative International Dictionary of English v.0.48:

Isle \Isle\, n. [OF. isle, F. [^i]le, L. insula; cf. Lith. sala.
   Cf. Insulate.]
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   1. An island. [Poetic]
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            Imperial rule of all the seagirt isles. --Milton.
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   2. (Zool.) A spot within another of a different color, as
      upon the wings of some insects.
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The Collaborative International Dictionary of English v.0.48:

Isle \Isle\, v. t.
   To cause to become an island, or like an island; to surround
   or encompass; to island. [Poetic]
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         Isled in sudden seas of light.           --Tennyson.
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WordNet (r) 3.0 (2006):

isle
    n 1: a small island [syn: isle, islet]