1. optical instruments with a single eyepiece for viewing distant objects with one eye, essentially half of a pair of binoculars

Examples

• The hiker packed lightweight monoculars for birdwatching on the trail.
• Monoculars are more compact than binoculars but provide less depth perception.
• She used monoculars to get a closer look at the distant mountain peak.
• The theater offers monoculars for rent to patrons in the back rows.
• Hunters often prefer monoculars because they’re easier to carry and use quickly.
• The astronomy club recommended small monoculars for beginners interested in stargazing.