rosin

v. rub with rosin, treat with rosin

n. (Chemistry) yellowish or brownish resin derived from the oleoresin or wood of pine trees (commonly used in varnishes, inks, and as a treatment for the bow of some musical instruments)

Rosin, formerly called colophony or Greek pitch (Pix græca), is a solid form of resin obtained from pines and some other plants, mostly conifers, produced by heating fresh liquid resin to vaporize the volatile liquid terpene components. It is semi-transparent and varies in color from yellow to black. At room temperature rosin is brittle, but it melts at stove-top temperatures. It chiefly consists of different resin acids, especially abietic acid.
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Noun
1. any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules
(synonym) resin
(hypernym) organic compound
(hyponym) East India kino, Malabar kino, kino gum
Verb
1. rub rosin onto; "rosin the violin bow"
(hypernym) rub
(derivation) resin

(v. t.)
To rub with rosin, as musicians rub the bow of a violin.
  

(n.)
The hard, amber-colored resin left after distilling off the volatile oil of turpentine; colophony.
  

Properly "naphtha," as it is both in the LXX. and the Vulgate, as well as in the Peshito-Syriac. Pliny mentions naphtha as a product of Babylonia, similar in appearance to liquid bitumen, and having a remarkable affinity to fire.