Rooms or chambers in a building, such as in a ship or factory, where fires are kept burning or where combustion engines operate.
From 'fire' (Old English 'fyr') combined with 'room' (Old English 'rum'), referring to dedicated spaces where fire was maintained or controlled for heating or power generation.
On early steamships, the fireroom was the hottest place aboard—stokers would shovel coal for hours in temperatures exceeding 120°F, making it one of the most dangerous jobs at sea!
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