interisland

Etymology tree
Proto-Indo-European *h₁én
Proto-Indo-European *h₁entér
Proto-Italic *n̥ter
Latin inter
Latin inter-bor.
English inter-
Proto-Indo-European *h₂ékʷeh₂
Proto-Germanic *awjō
Proto-Indo-European *lendʰ-
Proto-Indo-European *-om
Proto-Germanic *landą
Proto-Germanic *awjōlandą
Proto-West Germanic *auwjuland
Old English īeġland
Middle English ilond
English iland
English island
English interisland
From inter- + island.