eyecup

noun

eye·​cup ˈī-ˌkəp 

1

: a small oval cup with a rim curved to fit the orbit of the eye used for applying liquid remedies to the eyes

2

: optic cup

3

: a usually rubber cup at the eyepiece of an optical instrument (such as binoculars) for keeping out extraneous light

Examples of eyecup in a Sentence

Recent Examples on the Web

Key features: rubber eyecups, waterproof, 42 mm objectives, telescope mount, multi-coated lenses, BaK-4 prisms, 23.1 oz (655 g) weight. —Rich Owen, Space.com, 17 Oct. 2025

With a 10x optical zoom that’s crystal clear, comfortable rubber eyecups, and a removable wrist strap, this is the ultimate educational toy for young explorers to take to their favorite nature spots or even the front yard. —Toby Rose, Parents, 24 Oct. 2024

Our tester found the twist-out eyecups and diopter worked well, but the objective lens caps were a tight fit. —Scott Gilbertson, WIRED, 6 Oct. 2024

While keeping the left side covered, rotate the diopter dial on the right eyecup until the image is in focus. —Katherine Alex Beaven, Travel + Leisure, 17 Jan. 2024

Word History

First Known Use

1586, in the meaning defined at sense 1

Rhymes for eyecup

• buttercup
• backup
• blowup
• breakup
• buildup
• checkup
• cleanup
• holdup
• hookup
• lineup
• lockup
• makeup

Kids Definition

eyecup

noun

eye·​cup ˈī-ˌkəp 

: a small oval cup with a rim curved to fit the orbit of the eye and used for applying liquid medicine to the eyes

Medical Definition

eyecup

noun

eye·​cup ˈī-ˌkəp 

1

: a small oval cup with a rim curved to fit the orbit of the eye used for applying liquid remedies to the eyes

2

: optic cup