/ Dictionary / Index H heliozoan: Meaning and Definition of Find definitions for: he•li•o•zo•an Pronunciation: (hē"lē-u-zō'un), [key] — n. a protozoan of the order Heliozoa, having a spherical body and radiating pseudopods. —adj. belonging or pertaining to the Heliozoa. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: heliozoan (Thesaurus) heliotype helipad Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language