a slender threadlike outgrowth on the surface of an animal; esp any of the many pigmented hairs that form the characteristic coat of a mammal
a structure resembling a hair, e.g. on a plant
the coating of hairs, esp on the human head or other body part, or on an animal's body
haircloth
a hair's breadth
They won by a hair
hair of the dog
an alcoholic drink taken to cure a hangover
[in full the hair of the dog that bit you, referring to the belief that the best antidote to the bite of a mad dog is to be made from the dog's own hair.]in somebody's hair
persistently annoying or distracting somebody
keep your hair on!
Brit, informal calm down!
let one's hair down
to relax and enjoy oneself
make somebody's hair stand on end
to give somebody them a fright
not turn a hair
to give not the least indication of surprise or alarm
She did not turn a hair when told of the savage murder
hairless adj
hairlike adj
[Old English hǣr]