/ Dictionary / Index C convoluted tubule: Meaning and Definition of Find definitions for: con'voluted tu'bule Pronunciation: [key] — n. Anat. a portion of the nephron in the kidney that functions in concentrating urine and in maintaining salt, water, and sugar balance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. convoluted convolution Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language