IPA: //sæ.nɪˈtɔː.ri.əm//
KK: /sænɪˈtɔːrɪəm/
A place where people go to receive treatment for long-term illnesses, especially those related to the lungs or tuberculosis.
After her illness, she spent several months in a sanitorium to recover her health.
Sanitorium → It is formed from "sanus" (meaning healthy) and "-orium" (a suffix indicating a place). The word "sanitorium" refers to a place for health or healing, typically a facility for recuperation.
Think of a place that promotes health ('sanus') — that's why a sanitorium is a place for healing.