/ Dictionary / Index S Sisley: Meaning and Definition of Find definitions for: Sis•ley Pronunciation: (sis'lē Fr. sēs&sylplā'), [key] 1839–99, French painter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sisler Sismondi Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language