What is "vestlet"

Vestlet \Vest"let\, n. [Dim. of vest.] (Zo["o]l.) 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.

n. 1 A small vest. 2 (context zoology English) Any of several species of actinian of the genus (taxlink Cerianthus genus noshow=1), with a long, smooth, tapering body and two separate circles of tentacles around the mouth.