This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An eyeglass for one eye.

n. a single lens, usually in a wire frame, and used to correct vision for only one eye

n. An eyeglass for one eye.

n. A monoculous or one-eyed animal; a monocule.

n. A glass for one eye; a single eye-glass.

n. In photography, an uncorrected spectacle-lens, usually periscopic, of about 1½ inches diameter, and of a focus of 2 inches and upward.

n. lens for correcting defective vision in one eye; held in place by facial muscles

"Boingboing posted an image of a half-veil with a built-in monocle, which I passed along to SuRa, who then did this fabo drawing."

lense    lens    lens system   

glasses    spectacles   

canonical   

eyeglasses    eyeglass    flat-brimmed    morning-dress    Etonian    tail-coat    schlag    loupe    sunglasses    barrette