IPA: /ˌpɒlɪˈfeɪdʒə/
KK: /pɑˈlɪfəˌɡiə/
A condition where a person has an excessive desire to eat or an unusually high appetite.
After his illness, he experienced polyphagia and felt hungry all the time.
Polyphagia → It is formed from "poly-" (meaning many) and "phagia" (from Greek "phagein", meaning to eat). The word describes the condition of eating excessively or having an appetite for many foods.
Think of 'many' ('poly-') and 'eating' ('phagia') to remember that polyphagia refers to eating a lot or having a strong appetite.