Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
roll-on is a noun meaning "a dispenser of a liquid cosmetic (such as a deodorant) having a revolving ball as an applicator". It carries 2 recorded senses.
a dispenser of a liquid cosmetic (such as a deodorant) having a revolving ball as an applicator
a woman's foundation garment rolled on to the hips
Definitions, synonyms and semantic relations for roll-on come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.