This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The lens or lens group closest to the eye in an optical instrument; an ocular. Also called eyeglass.

n. The lens (or combination of lenses) at the eye end of a microscope or telescope by which the image is viewed.

n. The lens, or combination of lenses, at the eye end of a microscope, telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed.

n.

n. In an optical instrument, the lens or combination of lenses to which the eye is applied.

n. In entomology, the eye-covering in the pupæ of lepidopterous insects.

n. An eyepiece with right-angled reflection-prism attached to the eye-lens, so that the observer looks in at the side, perpendicularly to the axis of the instrument.

n. combination of lenses at the viewing end of optical instruments

"Bent to the eyepiece was an old woman with long, black hair, wet as a well-used mop."

erecting eyepiece   

lense    lens    lens system   

spectral eyepiece    continental eyepiece    goniometer-eyepiece    orthoscopic eyepiece    ramsden's eyepiece    monocentric eyepiece    high eyepiece    huygenian eyepiece    compensating eyepiece    terrestrial eyepiece   

ocular   

diffuser    reticle    viewfinder    periscope    collimator    crosshair    caliper