LUR-lew[ˈløy̯ly]
Pronunciation: SchwaWolf · CC0 · Wikimedia Commonsthe wave of wet heat that comes off the stones when the water goes on
Closest in English: steam, vapour, vapor. None of them covers it.
The word goes back to a root meaning spirit or breath, which is a fair description of what comes off the stones. Finns argue about good and bad löyly the way the English argue about tea, and the country has roughly one sauna for every two people.
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Round two, moment, was where most points went.