[hol-uh-thoor-ee-uhn, hoh-luh-]
any echinoderm of the class Holothuroidea, comprising the sea cucumbers.
belonging or pertaining to the Holothuroidea.
Also, holothurioid [hol-uh-thoor-ee-oid] .

1835–45; < Neo-Latin Holothuri(a) genus name (plural of Latin holothūrium < Greek holothoúrion kind of zoophyte, equivalent to holo- holo- + -thourion < ?) + -an

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World English Dictionary
holothurian (ˌhɒləˈθjʊərɪən)
1.  any echinoderm of the class Holothuroidea, including the sea cucumbers, having a leathery elongated body with a ring of tentacles around the mouth
2.  of, relating to, or belonging to the Holothuroidea
[C19: from New Latin Holothūria name of type genus, from Latin: water polyp, from Greek holothourion, of obscure origin]

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American Heritage
Science Dictionary
holothurian   (hŏl'ə-thr'ē-ən, hō'lə-)  Pronunciation Key 
Any of various echinoderms of the class Holothuroidea, characterized by elongated bodies with tentacles around the mouth and five rows of tube feet. Holothurians are softer than other echinoderms because they lack spines and the skeleton is greatly reduced. Holothurians can extrude their internal organs to distract predators and grow a new set within a few weeks. Also called sea cucumber.
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Example sentences
The pink and white creatures are probably a species of holothurian.
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