/ Dictionary / Index E eutherian: Meaning and Definition of Find definitions for: eu•the•ri•an Pronunciation: (y-thēr'ē-un), [key] — adj. belonging or pertaining to the group Eutheria, comprising the placental mammals. —n. a eutherian animal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: eutherian (Thesaurus) euthenics euthermic Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language