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holothurian

[hol-uh-thoor-ee-uhn, hoh-luh-]

noun

any echinoderm of the class Holothuroidea, comprising the sea cucumbers.

adjective

belonging or pertaining to the Holothuroidea.

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Holothurian has a plethora of syllables.

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an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.

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Also, hol·o·thu·ri·oid

[hol-uh-thoor-ee-oid] .

Origin:
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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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins

World English Dictionary

holothurian (ˌhɒləˈθjʊərɪən)

—n
1.	any echinoderm of the class Holothuroidea, including the sea cucumbers, having a leathery elongated body with a ring of tentacles around the mouth

—*adj*
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage

Science Dictionary

holothurian

(hŏl'ə-th

r'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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holothurian

hol·o·thu·ri·an