/ Dictionary / Index P product mark: Meaning and Definition of Find definitions for: prod'uct mark" Pronunciation: [key] a trademark used on only one product. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. product line proem Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language