What does kurort mean?

I was reading about Erwin Schrödinger’s creative spurt in 1925–1926, when he wrote “Quantization as an Eigenvalue Problem” and a series of additional papers formalizing quantum mechanics and providing formulas to calculate the particle/wave behavior of electrons of various atoms at distinct excitation levels. My book, The Arrow of Time: A Voyage Through Science to Solve Time’s Greatest Mystery, notes that this creative burst, which won Schrödinger the Nobel Prize for Physics in 1933, came during a rough spell in his marriage. It says he had retreated to an Alpine kurort and spent the time with an unknown mistress. I tried to look kurort up, but can’t read any of the references I found. Does anyone know what the word means?