different between zylonite vs xylonite

English

zylonite (plural zylonites)

From an old trademark, presumably xylo- +? -ite.

xylonite (countable and uncountable, plural xylonites)

(obsolete) Celluloid.
- 1920, James Duff Brown, William Charles Berwick Sayers, Manual of library economy
  A simple, effective shelf label-holder is made from strips of transparent xylonite bent in a rectangular form...
- 1923, George Handley Knibbs, Presidential Address to the Australian Association for the Advancement of Science at the New Zealand Meeting (page 5)
  […] the perfumes and flavouring-substances, the explosives, the viscoses, celluloids, xylonites, bakelites, &c., […]

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