noun \ˈräz-ən, ˈrz-\

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

Seen & Heard

What made you want to look up rosin? Please tell us where you read or heard it (including the quote, if possible).