| 1. | any of the numerous fine, usually cylindrical, keratinous filaments growing from the skin of humans and animals; a pilus. |
| 2. | an aggregate of such filaments, as that covering the human head or forming the coat of most mammals. |
| 3. | a similar fine, filamentous outgrowth from the body of insects, spiders, etc. |
| 4. | Botany. a filamentous outgrowth of the epidermis. |
| 5. | cloth made of hair from animals, as camel and alpaca. |
| 6. | a very small amount, degree, measure, magnitude, etc.; a fraction, as of time or space: He lost the race by a hair. |
| 7. | get in someone's hair, Slang. to annoy or bother someone: Their snobbishness gets in my hair. |
| 8. | hair of the dog, Informal. a drink of liquor, supposed to relieve a hangover: Even a hair of the dog didn't help his aching head. Also, hair of the dog that bit one. |
| 9. | let one's hair down, Informal.
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| 10. | make one's hair stand on end, to strike or fill with horror; terrify: The tales of the jungle made our hair stand on end. |
| 11. | split hairs, to make unnecessarily fine or petty distinctions: To argue about whether they arrived at two o'clock or at 2:01 is just splitting hairs. |
| 12. | tear one's hair, to manifest extreme anxiety, grief, or anger: He's tearing his hair over the way he was treated by them. Also, tear one's hair out. |
| 13. | to a hair, perfect to the smallest detail; exactly: The reproduction matched the original to a hair. |
| 14. | without turning a hair, without showing the least excitement or emotion. Also, not turn a hair. |

hair (hâr)
n.
Any of the cylindrical, keratinized, often pigmented filaments characteristically growing from the epidermis of a mammal.
A growth of such filaments, as that forming the coat of an animal or covering the scalp of a human.
One of the fine hairlike processes of a sensory cell.
hair (hâr) Pronunciation Key
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make one's hair stand on end
Also, make one's hair curl. Terrify one, as in The very thought of an earthquake makes my hair stand on end, or Diving off a high board is enough to make my hair curl. The first term, first recorded in 1534, alludes to goose pimples prompted by fear, which cause the hairs around them to stand up. The variant dates from the mid-1900s.