名詞 hair:

1. 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
2. a very small distance or space
   同義詞：hair's-breadth, hairsbreadth, whisker
3. filamentous hairlike growth on a plant
   同義詞：fuzz, tomentum
4. any of the cylindrical filaments characteristically growing from the epidermis of a mammal
   同義詞：pilus
5. cloth woven from horsehair or camelhair; used for upholstery or stiffening in garments
   同義詞：haircloth
6. a filamentous projection or process on an organism

1. I'll have my hair trimmed tomorrow.
   明天我要修剪頭發(fā)。
2. She was slender and had long dark hair.
   她身材苗條，有一頭長(zhǎng)長(zhǎng)的黑發(fā)。
3. She wears her hair in a bun.
   她把頭發(fā)盤成一個(gè)髻。
4. Don't pull my hair!
   別扯我的頭發(fā)！
5. We escaped by a hair's breadth.
   我們從九死一生的險(xiǎn)境中逃出。
6. She won by a hair.
   她以微弱的優(yōu)勢(shì)獲勝。
7. The clothes some young people wear nowadays really make your hair curl.
   如今有些年輕人穿的服裝真會(huì)把你嚇一跳。
8. My hair has grown very long.
   我的頭發(fā)長(zhǎng)得很長(zhǎng)了。

hair

n.（名詞）

Any of the cylindrical, keratinized, often pigmented filaments characteristically growing from the epidermis of a mammal.
毛發(fā)：哺乳動(dòng)物特有的，生長(zhǎng)于表皮的柱狀、有角質(zhì)而且通常含有色素的細(xì)絲
A growth of such filaments, as that forming the coat of an animal or covering the scalp of a human being.
生毛（發(fā)）：毛發(fā)生長(zhǎng)，如形成動(dòng)物的皮毛或蓋住人的頭皮
A filamentous projection or bristle similar to a hair, such as a seta of an arthropod or an epidermal process of a plant.
茸毛：與毛發(fā)相似的細(xì)絲狀突出物或刺毛，比如節(jié)肢動(dòng)物的剛毛，或植物表面細(xì)胞的生成
Fabric made from the hair of certain animals:
毛織物：由某種動(dòng)物毛做成的織物：
例句：
a coat of alpaca hair.
羊駝毛大衣

A minute distance or narrow margin:
一發(fā)之差：極小的距離或狹小的空白：
例句：
won by a hair.
險(xiǎn)勝

A precise or exact degree:
精確，準(zhǔn)確：精確或準(zhǔn)確的程度：
例句：
calibrated to a hair.
極其精確的校準(zhǔn)

來(lái)源：
Middle English her
中古英語(yǔ) her
from Old English hôr
源自 古英語(yǔ) hôr