air passage

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a duct that provides ventilation (as in mines)
• Syn:
air duct, airway
• Hypernyms:
duct
• Hyponyms:
register, snorkel, schnorkel, schnorchel, snorkel breather,
breather, upcast, ventilation shaft
• Part Meronyms:
vent, venthole, vent-hole, blowhole