tail fan

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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

First recorded in 1890–95
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British Dictionary definitions for tail fan

tail fan

noun

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