질병이 · 질병을
disease, illness
Example
손을 자주 씻으면 많은 질병을 예방할 수 있어요.
Washing your hands often can prevent many diseases.
Word parts
질 disease+병 sickness
Literally 'disease and sickness.'
Good to know
질병 is formal and written; in conversation people usually just say 병.
Related words