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: the lens or combination of lenses at the eye end of an optical instrument
Examples of eyepiece in a Sentence
Recent Examples on the Web
That’s not the case for a monocular, which merely requires one eyepiece to be focused.
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Jamie Carter, Space.com, 20 Jan. 2025
The erect image is then transmitted to the eyepiece lens, where it is magnified for viewing.
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Matt Morris, Space.com, 16 Jan. 2025
This will allow enough light to reach the eyepiece.
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Matt Morris, Space.com, 27 Dec. 2024
The large knobs are easy to turn, and the eyepiece stays in place (and focus), making this a great starter microscope for young scientists.
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Cheryl Fenton, Parents, 5 Dec. 2024
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Word History
First Known Use
1729, in the meaning defined above
Dictionary Entries Near eyepiece
Cite this Entry
“Eyepiece.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/eyepiece. Accessed 6 Feb. 2025.
Kids Definition
eyepiece
noun
eye·piece
ˈī-ˌpēs
: the lens or combination of lenses at the eye end of an optical instrument (as a microscope or telescope)
Medical Definition
eyepiece
noun
eye·piece
ˈī-ˌpēs
: the lens or combination of lenses at the eye end of an optical instrument
called also ocular
More from Merriam-Webster on eyepiece
Nglish: Translation of eyepiece for Spanish Speakers
Britannica English: Translation of eyepiece for Arabic Speakers
Britannica.com: Encyclopedia article about eyepiece
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