/ Dictionary / Index W water on the brain: Meaning and Definition of Find definitions for: wa'ter on the brain' Pronunciation: [key] hydrocephalus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. water of hydration water on the knee Related Content Daily Word Quiz: menagerie Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language