hair of the dog

noun

1. any of the fine, threadlike outgrowths from the skin of an animal or human being
2. a growth of these; esp.,
   1. the growth covering the human head
   2. the growth covering all or part of the skin of most mammals
3. material woven from hair
4. an extremely small space, margin, degree, etc.: to miss by a hair
5. Bot. a threadlike growth on a plant; trichome

adjective

1. made of or with hair
2. for the care of the hair: hair tonic