The Collaborative International Dictionary of English v.0.48:

Colophony \Col"o*pho`ny\ (k[o^]l"[-o]*f[=o]*n[y^] or
   k[-o]*l[o^]f"[-o]*n[y^]; 277), n. [Gr. 'h kolofwni`a (sc.
   "rhti`nh resin, gum) resin, fr. Kolofw`nios of or from
   Colophon in Ionia.]
   Rosin.
   [1913 Webster]

WordNet (r) 3.0 (2006):

colophony
    n 1: translucent brittle substance produced from pine oleoresin;
         used especially in varnishes and inks and on the bows of
         stringed instruments