monocular

adjective

1. having only one eye.
2. of, relating to, or for the use of only one eye: a monocular microscope.

noun

3. a monocular instrument or device.

adjective

1. having to do with or using only one eye

noun

2. a device for use with one eye, such as a field glass

adj.1630s, from Late Latin monoculus “one-eyed,” from Greek monos “alone, single” (see mono-) + Latin oculus “eye” (see eye (n.)). adj.

1. Having or affecting one eye only.
2. Having a single eyepiece, as certain microscopes or other optical instruments.