facial hair noun3 •Hair on, or from, the face of a human, such as the eyebrows, beard or moustache.Shaving gear? The man had a beard—or he had one the last time Marianne had seen him. And yet there were flecks of shaving foam and facial hair in the sink. — 1988 •Hair on, or from, the face of an animal. •(rare) A single hair on, or from, the face.In (b), one facial hair of the cat is damaged. This can be categorized as size, shape, or a color defect. — 2021 formsfacial hairs