hair color; fur color
Refers to the color of animal hair or fur. Also used for human hair color, though less common than 髪色.
This dog has an unusual fur color.
Figurative use comparing a person's character or nature to an animal's coat color. Often used in the phrase 毛色が違う (to be of a different type).
Cats come in various fur colors.
He is a different type from the other employees.
That new employee has a unique disposition, doesn't he?
Compound of 毛 (hair, fur) and 色 (color). The figurative sense likely derives from the idea that an animal's coat color can indicate its breed or temperament.