/ Dictionary / Index D dertrum: Meaning and Definition of Find definitions for: der•trum Pronunciation: (dûr'trum), [key] — pl. -tra the extremity of the maxilla of a bird's bill, esp. when hooked or differentiated from the rest of the bill, as in pigeons and plovers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. derry dervish Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language