onsen

/AA1 N S AH0 N/
noun
  1. 1

    A (Japanese) hot spring.

    โ€œThe hottest springs in Japan aren't in the north but at the Obama Onsen outside Nagasaki.โ€

  2. 2

    A Japanese-style resort hotel at a natural hot spring, offering on-site bathing.

    โ€œWe stayed at a traditional onsen with tatami, yukata, and kaiseki at Onyang outside Seoul.โ€

Source: https://en.wiktionary.org/wiki/onsen