noun Date: 1940 any of a class of synthetic rubbers that are made by copolymerizing isobutylene with a small amount usually of isoprene at low temperature
BUTYL RUBBER
Meaning of BUTYL RUBBER in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012