/ Dictionary / Index T TPN: Meaning and Definition of Find definitions for: TPN Pronunciation: [key] total parenteral nutrition. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tpn (Thesaurus) tpm TPR 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