DictionarymonocleSingle eyeglass lens
noun

monocle

MAH-nuh-kul/ˈmɑːnəkl/

A single eyeglass lens worn over one eye.

The monocle covers one eye while the other remains bare.

Close-up portrait showing a single round eyeglass seated around one eye, with the other eye bare and no hand holding the lens.
Etymology

“Single” and “eye” originally formed a description meaning “one-eyed.” That description became the name of an eyeglass serving just one eye.

In context

Enhanced Public Domain93:14
he screwed his monocle into his eye and bent over the pillow
1920s Mystery Audiobook • Dorothy L. Sayers - Whose Body?

More examples

  • She fits the monocle over her right eye.
  • His monocle falls out when he raises his eyebrows.
  • The antique shop displays several monocles beside a pair of spectacles.

Forms

monocle · monocles

monocular adjective — Involving or intended for one eye.

Similar words

eyeglass
A broader term for a lens used to aid vision.
glasses
Usually have two lenses in a frame, covering both eyes.