the lens or combination of lenses in an optical instrument nearest the eye of the observer
WordReference Random House Learner's Dictionary of American English © 2026
eye•piece /ˈaɪˌpis/USA pronunciation
n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2026- Opticsthe lens or combination of lenses in an optical instrument such as a microscope through which the eye views the image.
eye•piece
(ī′pēs′),USA pronunciation n.
- Opticsthe lens or combination of lenses in an optical instrument through which the eye views the image formed by the objective lens or lenses;
ocular. See diag. under microscope.
- eye + piece 1780–90
Collins Concise English Dictionary © HarperCollins Publishers::
'eyepiece' also found in these entries (note: many are not synonyms or translations):
Galilean telescope
- Gregorian telescope
- Huygens eyepiece
- Kellner eyepiece
- Newtonian telescope
- Ramsden eyepiece
- adjust
- astronomical telescope
- binocular
- camera lucida
- comparison microscope
- compound microscope
- drawtube
- eye lens
- eyeglass
- fiberscope
- field lens
- objective
- ocular
- prismatic telescope
- reticle
- stadia
- stereoscope
- telescope
- terrestrial telescope
- viewer