sights

Từ điển WordNet v3.1 - WordNet Dictionary

noun

an optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument
• Hypernyms:
optical instrument
• Hyponyms:
bombsight, gunsight, gun-sight
• Part Holonyms:
firearm, piece, small-arm, surveying instrument, surveyor's instrument
• Part Meronyms:
eyepiece, ocular