The word hygiene traces directly to ancient Greek mythology and language.
In Greek mythology, Hygieia (Roman: Salus) was the goddess of health, cleanliness, and sanitation.
For centuries, hygiene was intertwined with religious purity. The 19th-century germ theory (Pasteur, Koch, Lister) transformed it into a scientific discipline—handwashing, sterilization, sewage systems, food safety—saving millions of lives.
Today, "hygiene" encompasses personal, domestic, medical, and public health practices. The ancient goddess's name lives on in every handwash, vaccine, and clean water system—a testament to the enduring power of prevention.