/ Dictionary / Index H holothurian: Meaning and Definition of Find definitions for: hol•o•thu•ri•an Pronunciation: (hol"u-thoor'ē-un, hō"lu-), [key] — n. any echinoderm of the class Holothuroidea, comprising the sea cucumbers. —adj. belonging or pertaining to the Holothuroidea. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: holothurian (Thesaurus) holosericeous holotype Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language