/ Dictionary / Index A archaeo-: Meaning and Definition of Find definitions for: archaeo- Pronunciation: [key] a combining form meaning “ancient,” used in the formation of compound words: archaeopteryx; archaeology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. archaebacteria archaeoastronomy Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language