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(Chemistry) a type of plastic or celluloid that resembles amber, coral, or tortoise shell and is used in jewellery, combs, or other objects
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


The second edition of Webster’s New International Dictionary (1959) says it was the original name for Celluloid. The 1940 Merck Index indicates that celluloid and zylonite are the same. An early-twentieth-century dictionary says zylonite (Xylonite) is similar to celluloid and is made from pyroxylin. The 1895 Montgomery Ward Catalog lists both celluloid and zylonite harness rings, which implies that they were different (although they might be of the same material but from different manufacturers).
1001 Words and Phrases You Never Knew You Didn’t Know by W.R. Runyan Copyright © 2011 by W.R. Runyan
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ASCENSION, MARE BOAT--Wreck of unknown racing-plane, Parden rudder, wire-stiffened xylonite vans, and Harliss engine-seating, sighted and salved 7 20' S.
Parkesine would later be renamed Xylonite, Ivoride and then finally Celluloid - but Parkes' eponymous material paved the way for the development of what we now know as the plastics industry.
Spill called his refined product Xylonite, by which time his competitor, a New York printer, John Wesley Hyatt (1837-1920) accepted a challenge from an American billiard ball maker to make a substitute for ivory.