Definify.com
Webster 1913 Edition
Isle
1. 
An island. 
[Poetic] 
Imperial rule of all the seagirt 
isles
. Milton.
2. 
(Zool.) 
A spot within another of a different color, as upon the wings of some insects. 
 Isle
,Verb.
 T.
 To cause to become an island, or like an island; to surround or encompass; to island. 
[Poetic] 
Isled 
in sudden seas of light. Tennyson.