IPA: /ˈmɛdəlɪst/
KK: /ˈmɛdəlɪst/
A person who has won a medal in a competition, especially in sports.
The medallist proudly displayed their gold medal at the ceremony.
Medallist → It is formed from "medal" (from Old French *medaille*, meaning a coin or a medal) and "-ist" (meaning a person who). A medallist is a person who makes or is awarded a medal.
Think of a person who is associated with a 'medal' — the '-ist' indicates someone who does or specializes in something, so a medallist is someone who deals with medals.