"single eyeglass," 1886, from French monocle, noun use of adjective monocle "one-eyed, blind in one eye" (13c.), from Late Latin monoculus "one-eyed," from Greek monos "single, alone" (see mono-) + Latin oculus "eye" (see eye (n.)).
That this, a hybrid, a Gallicism, and a word with no obvious meaning to the Englishman who hears it for the first time, should have ousted the entirely satisfactory eyeglass is a melancholy illustration of the popular taste in language. [Fowler]
实用例句
1. The old lady could not read clearly without her monocle.
这位婆婆若不戴上她的单片眼镜，便无法阅读。
来自辞典例句
2. A cynic is a man who looks at the world with a monocle in mind's eye.