- mushroom ventilator
a ventilator having at the top of a vertical shaft a broad rounded cap that can be screwed down to close it.
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mushroom ventilator — noun : a ship s ventilator with a curved hood that may be raised or lowered to regulate the air in cabins below deck * * * a ventilator having at the top of a vertical shaft a broad rounded cap that can be screwed down to close it … Useful english dictionary
List of Latin words with English derivatives — This is a list of Latin words with derivatives in English (and other modern languages). Ancient orthography did not distinguish between i and j or between u and v. Many modern works distinguish u from v but not i from j. In this article both… … Wikipedia
Oxygen toxicity — Classification and external resources In 1942–43 the UK Government carried out extensive testing for oxygen toxicity in divers. The chamber is pressurised with air to 3.7 … Wikipedia