rosin

¹ros·in

noun \ˈrä-z^ən, ˈrȯ-, dialect ˈrȯ-zəm\

Definition of ROSIN

: 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

Origin of ROSIN

Middle English, from Anglo-French reisine, rosine resin

First Known Use: 13th century

²rosin

transitive verb

ros·inedros·in·ing \ˈräz-niŋ, ˈrȯz-; ˈrä-z^ən-iŋ, ˈrȯ-\

Definition of ROSIN

: to rub or treat (as the bow of a violin) with rosin

First Known Use of ROSIN

15th century

ros·in

noun \ˈräz-^ən, ˈrȯz-\   (Medical Dictionary)

Medical Definition of ROSIN

: a translucent amber-colored to almost black brittle friable resin that is obtained from the oleoresin or dead wood of pine trees or from tall oil and is used in pharmacology as an adhesive constituent in plasters, cerates, and ointments—called also colophony