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sunglasses

[suhn-glas-iz, -glah-siz] /ˈsʌnˌglæs ɪz, -ˌglɑ sɪz/
plural noun
1.
eyeglasses with colored or tinted lenses that protect the eyes from the glare of sunlight.
Origin
1800-1810
1800-10; sun + glasses

sunglass1

[suhn-glas, -glahs] /ˈsʌnˌglæs, -ˌglɑs/
noun
Origin
1800-10; sun + glass
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sunglasses

sunglasses

/ˈsʌnˌɡlɑːsɪz/
plural noun
1.
glasses with darkened or polarizing lenses that protect the eyes from the sun's glare

sunglass

/ˈsʌnˌɡlɑːs/
noun
1.
a convex lens used to focus the sun's rays and thus produce heat or ignition; burning glass
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for sunglasses
n.

1917, from sun (n.) + glasses. Earlier sunglass (1804) meant a burning glass.

Online Etymology Dictionary, © 2010 Douglas Harper
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11
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