The science of health, its promotion and preservation.
"Public health officials emphasize that hygiene is not just about cleanliness but encompasses the broader science of promoting and preserving human health."
In plain English: Hygiene is the practice of keeping yourself and your surroundings clean to avoid getting sick.
"Good hygiene is essential for preventing the spread of germs in schools and workplaces."
Usage: Hygiene refers to practices that maintain cleanliness and prevent disease rather than the scientific study itself. Use this word when discussing daily habits like handwashing or sanitation instead of medical procedures.
The word hygiene comes from Ancient Greek, where it originally described the "art of health." It entered English through French to refer specifically to practices that maintain good health.