What is the meaning of hair?

noun

• 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)
  • usage: "he combed his hair"; "each hair consists of layers of dead keratinized cells"
• A very small distance or space.
  • usage: "they escaped by a hair's-breadth"; "they lost the election by a whisker"
  • synonyms: hair's-breadth, hairsbreadth, whisker
• Filamentous hairlike growth on a plant.
  • usage: "peach fuzz"
  • synonyms: fuzz, tomentum
• Any of the cylindrical filaments characteristically growing from the epidermis of a mammal.
  • usage: "there is a hair in my soup"
  • synonyms: pilus
• Cloth woven from horsehair or camelhair; used for upholstery or stiffening in garments.
  • synonyms: haircloth
• A filamentous projection or process on an organism. .