IPA: /ˈθɜːrstə/
KK: /ˈθɜrstər/
A person who has a strong desire or need for something, often used to describe someone who is very thirsty.
After running in the sun, he was a real thirster, eager for a cold drink.
Thirster → The word is formed from "thirst" (from Old English "þirsta", meaning a strong desire for drink) and "-er" (meaning a person who). A thirster is a person who has a strong desire for drink, particularly water.
Think of someone who has a strong desire for a drink — that's what a thirster is.