/ Dictionary / Index I Islip: Meaning and Definition of Find definitions for: I•slip Pronunciation: (ī'slip), [key] — n. a town on the S shore of Long Island, in SE New York. 13,438. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Islington isls. Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language