Definition of fibreglass noun from the Oxford Advanced Learner's Dictionary

 

fibreglass

 noun
(especially US English fiberglass)noun
BrE BrE//ˈfaɪbəɡlɑːs//
 
; NAmE NAmE//ˈfaɪbərɡlæs//
 
(British English also glass fibre)(also US English glass fiber)[uncountable] Materials and properties
 
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a strong light material made from glass fibres and plastic, used for making boats, etc. a fibreglass racing yacht See related entries: Materials and properties