Definition of off-island in US English:

off-island

noun

British
  • An island off the shore of a larger, central, or main island; specifically the inhabited islands of the Isles of Scilly other than the main island of St Mary's.

adverb

North American
  • Off or away from an island.

adjective

North American
  • Not belonging to an island; done, produced, owned, etc., off an island.

Origin

Late 19th century; earliest use found in Margaret Courtney (1834–1920). From off- + island<br>early 20th century. From off + island. Compare earlier off-islander.

Pronunciation

off-island

/ˈɒfˌʌɪlənd/