Origin of rosinMiddle English altered ; from Middle French resine, resin
transitive verbros·ined, ros·in·ing, ros·ins
Origin of rosinMiddle English, variant of resin; see resin.
(countable and uncountable, plural rosins)
(third-person singular simple present rosins, present participle rosining, simple past and past participle rosined)
- To apply rosin to something.
- We waited expectantly as the guest violinist rosined up his bow in preparation to playing.