/ Dictionary / Index D dog's letter: Meaning and Definition of Find definitions for: dog's' let"ter Pronunciation: [key] the letter r, esp. when representing a trill. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dogsled Dog Star Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language