Source : Webster's Revised Unabridged Dictionary (1913)

Kauri resin \Kauri resin\, gum \gum\, or copal \copal\
   A resinous product of the kauri, found in the form of yellow
   or brown lumps in the ground where the trees have grown. It
   is used for making varnish, and as a substitute for amber.

Source : WordNet®

kauri resin
     n : resin of the kauri trees of New Zealand; found usually as a
         fossil; also collected for making varnishes and linoleum
         [syn: {kauri}, {kauri copal}, {kauri gum}]