Final answer:
The suffix -phagia refers to eating, and it is often used to describe conditions related to eating, such as polyphagia.
Step-by-step explanation:
The suffix that refers to eating is -phagia. This suffix is derived from the Greek word ‘phagein,’ which means ‘to eat.’ When attached to the end of a word, it usually describes conditions or actions related to eating. For instance, the term 'polyphagia' refers to the condition of excessive eating, which can be seen in some medical conditions such as diabetes.