magnifying glass

English
A magnifying glass

Noun

magnifying glass (plural magnifying glasses)

  1. An instrument made of convex glass, used to magnify.
    • 2013 September-October, Henry Petroski, “The Evolution of Eyeglasses”, in American Scientist:
      The ability of a segment of a glass sphere to magnify whatever is placed before it was known around the year 1000, when the spherical segment was called a reading stone, essentially what today we might term a frameless magnifying glass or plain glass paperweight.

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