/ Dictionary / Index S San Joaquin: Meaning and Definition of Find definitions for: San Joa•quin Pronunciation: (san" wo-kēn'), [key] a river in California, flowing NW from the Sierra Nevada Mountains to the Sacramento River. 350 mi. (560 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sanjak San Joaquin Valley fever Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language