/ Dictionary / Index P pup: Meaning and Definition of Find definitions for: pup Pronunciation: (pup), [key] — n., v., pupped, pup•ping. —n. a young dog; puppy. the young of certain other animals, as the rat or fur seal. a small plant developing as an offshoot from a mature plant. —v.i. to give birth to pups. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pup (Thesaurus) puny pupa Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language