It's the contraction of "badstuga" (bad=bath and stuga=a small house)
I'll just remember it as the place where people get basted...
The pronunciation on "bastu" is totally weird here. The "a" should have a short sound.
Like this: http://sv.forvo.com/search-sv/bastu/
In the new voice, the normal-speed sentence is okay but hovering over the word still gives a long a sound.
Sounds like bathtub to me
"Bathtub" is "badkar" in Swedish.
Literally it's "bathstove" ("bastow"?)
Can I use just sauna in swedish as well? It seems like an international word to me...
No, in Swedish it is always "bastu" :).
... which is short for "badstuga" by the way.
(Bad = bath, stuga = cottage)
Since the phenomenon is quite as original in Sweden as it is in Finland, there is also a proper Swedish word for it, whereas other languages/countries imported both the word and the phenomenon from Finland.
I'm glad we imported it from Finland. Sauna sounds so much better than bastu.
In Russian there's also a word "баня", and we use it more than "sauna"