/ Dictionary / Index I ichthyosaurus: Meaning and Definition of Find definitions for: ich•thy•o•saur•us Pronunciation: (ik"thē-u-sôr'us), [key] — pl. -us•es. ichthyosaur. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ichthyosaurus (Thesaurus) ichthyosaur ichthyosis Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language