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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]