eyepiece

Từ điển WordNet v3.1 - WordNet Dictionary

noun

combination of lenses at the viewing end of optical instruments (Freq. 1)
• Syn:
ocular
• Hypernyms:
lens, lense, lens system
• Part Holonyms:
optical telescope, binoculars, field glasses, opera glasses, light microscope, sights
• Part Meronyms:
reticle, reticule, graticule