Definitions

1. adjective

Relating to or using one eye or one ocular system; monocular vision.

“The astronaut had monocular vision due to the damage to his left eye.”

2. noun

An optical instrument that uses a single eye-piece and one lens system to magnify an object or scene.

“The scientist used a monocular to examine the microscopic details of the specimen.”

3. noun

A telescope or binocular with a single eyepiece.

“The stargazer used a monocular to observe the celestial bodies in the night sky.”