/ Dictionary / Index S San Andreas fault: Meaning and Definition of Find definitions for: San' An•dre'as fault' Pronunciation: (san' an-drā'us), [key] — Geol. Geol. an active strike-slip fault in W United States, extending from San Francisco to S California and forming the on-land portion of the western margin of the North American Plate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. San&ain;a San Angelo Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language