/ Dictionary / Index U ulmaceous: Meaning and Definition of Find definitions for: ul•ma•ceous Pronunciation: (ul-mā'shus), [key] — adj. belonging to the Ulmaceae, the elm family of plants. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ulm ulna Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language