/ Dictionary / Index W water on the knee: Meaning and Definition of Find definitions for: wa'ter on the knee' Pronunciation: [key] — Pathol. Pathol. an accumulation of fluid in the knee cavity caused by inflammation and trauma to the cartilages or membranes of the knee joint. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. water on the brain water opossum 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