/ Dictionary / Index T tail fan: Meaning and Definition of Find definitions for: tail' fan" Pronunciation: [key] — Zool. Zool. the fanlike posterior appendage of crayfish and lobsters, consisting of a telson and two uropods, used for rapid backward propulsion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tail end tail fin Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language