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tail fan

noun, Zoology
the fanlike posterior appendage of crayfish and lobsters, consisting of a telson and two uropods, used for rapid backward propulsion.
Origin of tail fan
1890-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for tail fan
  • They are the oldest known birds to have such a tail fan, which probably improved flight performance.
  • Geese are usually distinguished from overall color, characteristics of the flock, and occasionally the coloration of the tail fan.
British Dictionary definitions for tail fan

tail fan

the fanned structure at the hind end of a lobster or related crustacean, formed from the telson and uropods
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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