" Some of the species of Holothurians are called sea cucumbers, sea slugs, trepang, and bêche de mèr. Many are used as food, esp. by the Chinese. See Trepang."
[1913 Webster]
holothurian, n. & adj.
--n. any echinoderm of the class Holothurioidea, with a wormlike body, e.g. a sea cucumber.
--adj. of or relating to this class.
Etymology
mod.L Holothuria (n.pl.) f. Gk holothourion, a zoophyte