- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for tail fan
The uropods are generally very small, and do not form a tail-fan.
The uropods no longer form a tail-fan, but are adapted for firmly wedging the hind part of the body into the coils of the shell.
T, telson, having the uropods or appendages of the last abdominal somite spread out on either side of it, forming the “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