'Sunglass' definitions:
Definition of 'sunglass'
From: WordNet
noun
A convex lens that focuses the rays of the sun; used to start a fire
Definition of 'Sunglass'
From: GCIDE
- Sunglass \Sun"glass`\, n.; pl. Sunglasses. A convex lens of glass for producing heat by converging the sun's rays into a focus. "Lighting a cigar with a sunglass." --Hawthorne. [1913 Webster]