From The Collaborative International Dictionary of English v.0.48:

Vestlet \Vest"let\, n. [Dim. of vest.] (Zool.)
   Any one of several species of actinians belonging to the
   genus Cerianthus. These animals have a long, smooth body
   tapering to the base, and two separate circles of tentacles
   around the mouth. They form a tough, flexible, feltlike tube
   with a smooth internal lining, in which they dwell, whence
   the name.
   [1913 Webster]
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