monocular

adj

1. (not-comparable)Having one eye.

   “...one of his sparks alighted upon my eye and destroyed it making me a monocular ape;”

2. (not-comparable)Related to a monocle.

   “You are not such a foolish woman as to like to be seen with Fred Mostyn, that little monocular snob, after the aristocratic, handsome Basil Stanhope.”

3. (not-comparable)Of any optical system suitable for use by one eye at a time.

noun

1. (rare)A monocle.

   “The moony monocular set in his eye / Appeared to be scanning the Sweet Bye-and-Bye.”

2. (retronym)A monocular telescope, as opposed to binoculars.

   “Monoculars are designed to fit discreetly in the hand, improving their cosmetic appearance. Most monoculars sold today have one primary optical difference from binoculars: the ability to focus at close range. These are known as short-focus telescopes.”