/ Dictionary / Index C CSF: Meaning and Definition of Find definitions for: CSF Pronunciation: [key] — Physiol. Physiol. cerebrospinal fluid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. C-section csk. Related Content Daily Word Quiz: garrulous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language