Search Result for "sunglass": 
Wordnet 3.0

NOUN (1)

1. a convex lens that focuses the rays of the sun; used to start a fire; 



The Collaborative International Dictionary of English v.0.48:

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]


WordNet (r) 3.0 (2006):

sunglass
    n 1: a convex lens that focuses the rays of the sun; used to
         start a fire