sunglass

sun·glass  (sngls)

n.

1. A convex lens used to focus the sun's rays and produce heat, especially for ignition.

2. sunglasses Eyeglasses with tinted or polarizing lenses to protect the eyes from the sun's glare.

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sunglass [ˈsʌnˌglɑːs]

n

(Physics / General Physics) a convex lens used to focus the sun's rays and thus produce heat or ignition; burning glass

Thesaurus

Noun

1.

sunglass - a convex lens that focuses the rays of the sun; used to start a fire converging lens, convex lens - lens such that a beam of light passing through it is brought to a point or focus