\Res"in\ (r?z"?n), n. [F. r['e]sine, L. resina; cf. Gr.
"rhti`nh Cf. {Rosin}.]
Any one of a class of yellowish brown solid inflammable
substances, of vegetable origin, which are nonconductors of
electricity, have a vitreous fracture, and are soluble in
ether, alcohol, and essential oils, but not in water;
specif., pine resin (see {Rosin}).
Note: Resins exude from trees in combination with essential
      oils, gums, etc., and in a liquid or semiliquid state.
      They are composed of carbon, hydrogen, and oxygen, and
      are supposed to be formed by the oxidation of the
      essential oils. Copal, mastic, quaiacum, and colophony
      or pine resin, are some of them. When mixed with gum,
      they form the gum resins, like asafetida and gamboge;
      mixed with essential oils, they frorm balsams, or
      oleoresins.
{Highgate resin} (Min.), a fossil resin resembling copal,
   occuring in blue clay at Highgate, near London.
{Resin bush} (Bot.), a low composite shrub ({Euryops
   speciosissimus}) of South Africa, having smooth pinnately
   parted leaves and abounding in resin.