Hair (noun)

1. A threadlike outgrowth from the skin of humans, mammals, or some other animals.
2. An aggregate of such filaments, as that covering the human head or forming the coat of most mammals.
3. A similar fine outgrowth from the body of insects, spiders, etc.

Origin:

Old english hær, of germanic origin; related to dutch haar and german haar.

Examples:

1. He had a full head of hair.
2. She carefully styled her hair.
3. The hair on the back of my neck stood up.
4. The cat's fur was matted with hair.
5. She had hair the color of honey.