Definition of eyeglass
1a
: eyepiece
c
eyeglasses plural
: a device used to correct defects of vision or to protect the eyes that consists typically of a pair of glass or plastic lenses and the frame by which they are held in place : glasses
2
: eyecup sense 1
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Merriam-Webster unabridged
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Time Traveler for eyeglass
The first known use of eyeglass was in 1593
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