fiberglass
n. uncountable B2 Upper Intermediate US //ˈfaɪbɝˌɡɫæs// fiber·glass
n. a strong, light material made from tiny threads of glass. It is often used to build things like boats, cars, and insulation for houses.
n. a reinforced plastic material composed of glass fibres embedded in a resin matrix. Often used for its high strength-to-weight ratio and thermal insulation properties.
The boat has a strong fiberglass hull.
Workers wore protective masks while installing fiberglass insulation in the attic to avoid breathing in the tiny glass particles.
Modern aerospace engineering frequently utilizes fiberglass and other composite materials to reduce aircraft weight while maintaining the structural integrity required for high-altitude flight.