/ Dictionary / Index C cerebrospinal fluid: Meaning and Definition of Find definitions for: cerebrospi'nal flu"id Pronunciation: [key] — Physiol. Physiol. the fluid in the ventricles of the brain, between the arachnoid and pia mater, and surrounding the spinal cord. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cerebrospinal cerebrospinal meningitis Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language