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Buna rubber
Bu·na rub·ber [ bnə rùbbər, bynə rùbbər ]


noun 
Definition:
 
synthetic rubber: a synthetic rubber made from butadiene polymerized with sodium, manufactured in Germany in the 1920s and 1930s
[Mid-20th century. Blend of butadiene + Na, chemical symbol for sodium]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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