Rosin is a cannabis extract that is created by applying heat and pressure to the flower in order to withdraw resinous sap.
Merriam-Webster Online Dictionary
rosin (noun) a translucent amber-colored to almost black brittle friable resin that is obtained from the oleoresin or deadwood of pine trees or from tall oil and used especially in making varnish
transitive verb
to rub or treat (as the bow of a violin) with rosin
cannabis concentrate, solventless extract, hash oil, dab, resin
