rosin
A residue derived from the distillation and
subsequent removal of volatile materials (notably
turpentine) of the gum of the southern pines,
Pinus palustris and P. elliottii. Gum rosin exudes
from the living tree, while wood rosin is obtained
from the wood by steam and solvent processes.
Rosin is essentially an organic acid, the main
constituent being abietic acid (C 20 H
30 O 2 ). See also: ROSIN SIZE . (17 , 143 , 235 , 309 )
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