/ Dictionary / Index G giardia: Meaning and Definition of Find definitions for: gi•ar•di•a Pronunciation: (jē-är'dē-u, jär'-), [key] — n. any flagellate of the genus Giardia, parasitic in the intestines of vertebrates. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: giardia (Thesaurus) giaour giardiasis Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language