Definition: pyroxylin

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Source: WordNet (r) 1.7 

pyroxylin
     n : highly flammable nitrocellulose used in making collodion and
         plastics and lacquers [syn: pyroxyline]

Source: Webster's Revised Unabridged Dictionary (1913) 

Pyroxylin \Py*rox"y*lin\, n. (Chem.)
   A substance resembling gun cotton in composition and
   properties, but distinct in that it is more highly nitrified
   and is soluble in alcohol, ether, etc.; -- called also
   pyroxyle.