Fiberglass

n. material made from very fine glass fibers

Fiberglass (also called fibreglass and glass fibre) is material made from extremely fine fibers of glass. It is used as a reinforcing agent for many polymer products; the resulting composite material, properly known as fiber-reinforced polymer (FRP) or glass-reinforced plastic (GRP), is called "fiberglass" in popular usage.
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Noun
1. a covering material made of glass fibers in resins
(synonym) fibreglass
(hypernym) covering material

fiberglass /'fibəglɑ:s/
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FIBRA DI VETRO. FIBERGLASS