mustache

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The hair growing on the human upper lip, especially when cultivated and groomed.
2. n. Something similar to the cultivated, groomed hair on the human upper lip, as:
3. n. A group of bristles or hairs about the mouth of an animal.
4. n. Distinctive coloring or feathers near the beak of a bird.
5. n. Food or drink sticking conspicuously to the upper lip: wiped the milk mustache from my face.

Century Dictionary and Cyclopedia

1. n. The beard worn on the upper lip of men; the unshaven hair of the upper lip: frequently used in the plural, as if the hair on each side of the lip were to be regarded as a mustache.
2. n. . A long ringlet hanging beside the face, a part of a woman's head-dress in the seventeenth century.
3. n. In zoology:
4. n. Hairs or bristles like a mustache; whiskers; rictal vibrissæ mystaces.
5. n. A mystacine, malar, or maxillary stripe of color in a bird's plumage.

Wiktionary

1. n. A growth of facial hair between the nose and the upper lip.

GNU Webster's 1913

1. n. That part of the beard which grows on the upper lip; hair left growing above the mouth.
2. n. (Zoöl.) A West African monkey (Cercopithecus cephus). It has yellow whiskers, and a triangular blue mark on the nose.
3. n. (Zoöl.) Any conspicuous stripe of color on the side of the head, beneath the eye of a bird.
4. n. informal A stain or discoloration on the upper lip of a person.

WordNet 3.0

1. n. an unshaved growth of hair on the upper lip