noun (n)

• a covering for the body (or parts of it) consisting of a dense growth of threadlike structures (as on the human head); helps to prevent heat loss(noun.body)

  Example:
  He combed his hair.
  Each hair consists of layers of dead keratinized cells.
  

  source: wordnet30
• a very small distance or space(noun.quantity)

  Example:
  They escaped by a hair's-breadth.
  

  source: wordnet30
• filamentous hairlike growth on a plant(noun.plant)

  Synonym:
  fuzz, tomentum
  

  source: wordnet30
• any of the cylindrical filaments characteristically growing from the epidermis of a mammal(noun.body)

  Example:
  There is a hair in my soup.
  

  Synonym:
  pilus
  

  source: wordnet30
• cloth woven from horsehair or camelhair; used for upholstery or stiffening in garments(noun.artifact)

  Synonym:
  haircloth
  

  source: wordnet30
• a filamentous projection or process on an organism(noun.animal)

  source: wordnet30
• The collection or mass of filaments growing from the skin of an animal, and forming a covering for a part of the head or for any part or the whole of the body.(noun)

  source: webster1913