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monocle

While eyeglasses have two round lenses, one for each eye, a monocle has only one, and it's worn over a single eye.

It is rare to see anyone wearing a monocle these days, in part because it is held on the face solely by tensing the muscles around the eye over which it's worn. It was a popular part of a man's stylish ensemble beginning in the late 1700's, a fashion that lasted almost 100 years. The word monocle means "one-eyed" in French, from the Greek root monos, "single," and the Latin oculus, or "eye."

Definitions of monocle
  1. noun
    lens for correcting defective vision in one eye; held in place by facial muscles
    synonyms: eyeglass
    see moresee less
    type of:
    lens, lens system, lense
    a transparent optical device used to converge or diverge transmitted light and to form images
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