Chiefly of an animal or part of an animal: having a thick or extensive growth of hair; hairy. Also occasionally: having attractive or well-groomed hair.
Origin
Late Middle English; earliest use found in Care of Horses. From well + haired.
Definition of well-haired in US English:
well-haired
adjectiveˌwɛlˈhɛːd
Chiefly of an animal or part of an animal: having a thick or extensive growth of hair; hairy. Also occasionally: having attractive or well-groomed hair.
Origin
Late Middle English; earliest use found in Care of Horses. From well + haired.