Bu|na

Bu|na «BOO nuh, BYOO-», noun.

1. Trademark. a synthetic rubber made from butadiene, used especially in making automobile tires. Buna S is made by copolymerization of butadiene with styrene. Buna N is produced by the copolymerization of butadiene with acrylonitrile.

2. buna. this or any similarly produced rubber.

╂[< German Buna < Bu (tadien) + Na, symbol (< Natrium) for sodium]