/ Dictionary / Index R roll-on: Meaning and Definition of Find definitions for: roll-on Pronunciation: (rōl'on", -ôn"), [key] — adj. packaged in a tubelike container one end of which is equipped with a rotating ball that dispenses and spreads the liquid content directly. —n. a roll-on preparation: spray deodorants and roll-ons. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: roll-on (Thesaurus) roll-off rollout Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language