Definition of island :
1. A tract of land surrounded by water, and smaller than a continent. Cf. Continent.
2. Anything regarded as resembling an island; as, an island of ice.
3. See Isle, n., 2.
4. To cause to become or to resemble an island; to make an island or islands of; to isle.
5. To furnish with an island or with islands; as, to island the deep.
island (part of speech: noun)