One of the mysteries of the English language finally explained.
A preparation of pyroxylin (nitrocellulose) in ether and alcohol, used chiefly in microscopy for embedding specimens of tissues so that sections may be prepared.
Late 19th century; earliest use found in Journal of the Royal Microscopical Society. From German Celloidin from Cell- (in Cellulose) + -oid -oid + -in -in.
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