That part of the beard which grows on the upper lip; hair left growing above the mouth.
- The hair growing on the human upper lip, especially when cultivated and groomed.
- Something similar to the cultivated, groomed hair on the human upper lip, as:
- A group of bristles or hairs about the mouth of an animal.
- Distinctive coloring or feathers near the beak of a bird.
- Food or drink sticking conspicuously to the upper lip: wiped the milk mustache from my face.