Etymology
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From island + -ish.
Adjective
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islandish (comparative more islandish, superlative most islandish)
- (rare) Pertaining to or characteristic of an island; insular.
1577, John Dee, Perfect Arte of Navigation:He being, of himself, so bent: As, purposing, first, Inuincibly to Fortify the Chiefest and Vttermost Walls of his Ilandish Monarchy, against all Forreyn Encombrance possible […].