noun
: glass fibers in a mass resembling cotton batting or wool and used especially for thermal insulation and air filters or fabricated into various products (as acoustic tile or wallboard)
noun
: glass fibers in a mass resembling cotton batting or wool and used especially for thermal insulation and air filters or fabricated into various products (as acoustic tile or wallboard)
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012