Meaning of the word muller in English

What does muller mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

muller

US /ˈmʌlər/
UK /ˈmʌlə/

Noun

a person or thing that mulls

Example:
He's a deep muller, always thinking about complex problems.
The artist used a glass muller to grind pigments.