/ Dictionary / Index P Planck: Meaning and Definition of Find definitions for: Planck Pronunciation: (plängk), [key] 1858–1947, German physicist: Nobel prize 1918. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: planck (Thesaurus) planchette Planck's constant Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language