Definition of isle noun from the Oxford Advanced Learner's Dictionary

 

isle

 noun
noun
BrE BrE//aɪl//
 
; NAmE NAmE//aɪl//
 
(abbreviation I, I., Is.)
 
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used especially in poetry and names to mean ‘island’ the Isle of Skye the British Isles Word Origin Middle English ile, from Old French, from Latin insula. The spelling with s (also in 15th-cent. French) is influenced by Latin.
See the Oxford Advanced American Dictionary entry: isle