optical instrument

Từ điển WordNet v3.1 - WordNet Dictionary

noun

an instrument designed to aid vision
• Hypernyms:
instrument
• Hyponyms:
binoculars, field glasses, opera glasses, esophagoscope, oesophagoscope,
jeweler's glass, periscope, projector, sights, spectacles, specs,
eyeglasses, glasses, spectroscope, prism spectroscope
• Part Meronyms:
lens, lense, lens system