Webster's English Dictionary

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rosin

1. ros.in \'ra:z-*n, 'ro.z-, dial 'ro.-z*m\ n [ME, modif. of MF resine 
   resin] : a translucent amber-colored to almost black brittle friable resin 
   that i s obtained by chemical means from the oleoresin or dead wood of pine 
   trees or from tall oil and used in making varnish, paper size, soap, and 
   soldering flux and on violin bows
2. rosin \'ra:z-nin, 'ro.z-, -*n-in\ vt or ros.in.ing : to rub with rosin 
   (as the bow of a violin)