/ Dictionary / Index H hash mark: Meaning and Definition of Find definitions for: hash' mark" Pronunciation: [key] a service stripe. the symbol #. the marking formed by either inbounds line intersecting with one of the lines delineating yardage between the goal lines. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hashmark (Thesaurus) hashish hash-slinger Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language