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tail fan

noun, Zoology
1.
the fanlike posterior appendage of crayfish and lobsters, consisting of a telson and two uropods, used for rapid backward propulsion.
Origin
1890-1895
1890-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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

noun
1.
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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