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1. Abbr. Isl. or Is. or I. A land mass, especially one smaller than a continent, entirely surrounded by water.
2. Something resembling an island, especially in being isolated or surrounded, as:
(a) An unattached kitchen counter providing easy access from all sides.
(b) A raised curbed area, often used to delineate rows of parking spaces or lanes of traffic.
(c) The superstructure of a ship, especially an aircraft carrier.
3. Anatomy. A cluster of cells differing in structure or function from the cells constituting the surrounding tissue.

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