IPA: /haɪˈdʒiːnɪkli/
KK: /haɪˈdʒiːnɪkli/
In a way that promotes cleanliness and prevents the spread of germs or disease.
The food was prepared hygienically to ensure it was safe to eat.
Hygienically → It is formed from "hygiene" (from Greek "hygieinē", meaning health) and the suffix "-ically" (meaning in a manner relating to). The word "hygienically" means in a manner that promotes health or cleanliness.
Think of 'hygiene' which relates to health, and remember that 'hygienically' means doing something in a way that promotes health.