1. monocular - Noun
2. monocular - Adjective
Having only one eye; with one eye only; as, monocular vision.
Adapted to be used with only one eye at a time; as, a monocular microscope.
Source: Webster's dictionary;Collimation error:This is when the telescope or monocular is not parallel to the plane of the sextant. Source: Internet
Most sextants mount a 1 or 3-power monocular for viewing. Source: Internet
The creation of careful and accurate micrographs requires a microscopical technique using a monocular eyepiece. Source: Internet