/ Dictionary / Index O -oidea: Meaning and Definition of Find definitions for: -oidea Pronunciation: [key] a suffix used in the names of zoological classes or entomological superfamilies. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. -oid oidium Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language