1. Plural of fibreglass: a composite material made of glass fibers embedded in a resin matrix, used for insulation, reinforcement, and construction.
Usage: Chiefly British spelling; American English typically uses 'fiberglass'.; Often used as a mass noun in singular form, but the plural is standard when referring to multiple products or types.

Examples

• The boat hull was made from fibreglasses for durability and lightweight strength.
• Modern insulation often uses fibreglasses to improve energy efficiency in buildings.
• The manufacturer produces several different fibreglasses for specialized industrial applications.
• Fibreglasses are commonly used in automotive parts and aerospace components.
• The contractor selected fibreglasses for the roof panels because of their weather resistance.