IPA: /ˈɡlʌtən/
KK: /ˈɡlʌtən/
A person who eats too much food or drinks excessively, often in a greedy way.
He was such a glutton that he finished the entire pizza by himself.
Glutton comes from the Latin 'gluttire' (meaning to swallow or gulp down). The word describes someone who swallows food excessively, hence the meaning of indulging in food to an extreme degree.
Think of someone who 'gulps down' food ('gluttire') — that's why a glutton is someone who eats excessively.