air passage
English Thesaurus
1. a duct that provides ventilation (as in mines) (noun.artifact)
| hypernym | : | duct, |
| definition | : | an enclosed conduit for a fluid (noun.artifact) |
| hyponym | : | register, |
| definition | : | an air passage (usually in the floor or a wall of a room) for admitting or excluding heated air from the room (noun.artifact) |
| hyponym | : | upcast, |
| definition | : | air passage consisting of a ventilation shaft through which air leaves a mine (noun.artifact) |
| hyponym | : | ventilation shaft, |
| definition | : | a shaft in a building; serves as an air passage for ventilation (noun.artifact) |
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