<p><strong>noun</strong></p><ul><li>a material consisting of extremely fine filaments of glass that are combined in yarn and woven into fabrics, used in masses as a thermal and acoustical insulator, or embedded in various resins to make boat hulls, fishing rods, and the like.</li></ul><p><strong>verb</strong></p><ul><li>(used with object) to cover or form with fiberglass</li><li>(used without object) to use or work with fiberglass</li></ul>