/ Dictionary / Index S Sister of Loretto: Meaning and Definition of Find definitions for: Sis'ter of Lo•ret'to Pronunciation: (lu-ret'ō), [key] — Rom. Cath. Ch. Rom. Cath. Ch. a member of a congregation of sisters founded at Loretto, Kentucky, in 1812 and engaged in educational and missionary works. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sister of Charity Sister of Mercy 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