sunglass noun2 •[before a noun] Attributive form of sunglasses, used chiefly in phrases.They trekked through Europe, discovering designers like Melinda Gloss and the Italian sunglass manufacturer LGR, with whom they secured exclusive United States representation. — 2009 •(no longer used) A convex lens of glass for producing heat by converging the sun's rays into a focus. formssunglasses