/ Dictionary / Index H hologonidium: Meaning and Definition of Find definitions for: hol•o•go•nid•i•um Pronunciation: (hol"ō-gu-nid'ē-um, hō"lō-), [key] — pl. -nid•i•a soredium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hologamous hologram 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