hair

[ hair ]
/ hɛər /

noun

any of the numerous fine, usually cylindrical, keratinous filaments growing from the skin of humans and animals; a pilus.
an aggregate of such filaments, as that covering the human head or forming the coat of most mammals.
a similar fine, filamentous outgrowth from the body of insects, spiders, etc.
Botany. a filamentous outgrowth of the epidermis.
cloth made of hair from animals, as camel and alpaca.
a very small amount, degree, measure, magnitude, etc.; a fraction, as of time or space: He lost the race by a hair.

Idioms

Origin of hair

before 900; Middle English heer, Old English hǣr (cognate with Dutch, German haar, Old Norse hār), with vowel perhaps from Middle English haire hair shirt < Old French < Old High German hāria (cognate with Middle English here, Old English hǣre, Old Norse hǣra)
Related formshair·like, adjectivede·hair, verb (used with object)
Can be confusedhair hare
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for not turn a hair

hair

/ (hɛə) /

noun

Derived Formshairlike, adjective

Word Origin for hair

Old English hær; related to Old Norse hār, Old High German hār hair, Norwegian herren stiff, hard, Lettish sari bristles, Latin crescere to grow
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for not turn a hair

hair


n.

Old English hær "hair, a hair," from Proto-Germanic *khæran (cf. Old Saxon, Old Norse, Old High German har, Old Frisian her, Dutch and German haar "hair"), perhaps from PIE *ghers- "to stand out, to bristle, rise to a point" (cf. Lithuanian serys "bristle;" see horror).

Spelling influenced by Old Norse har and Old English haire "haircloth," from Old French haire, from Frankish *harja or some other Germanic source (see above). To let one's hair down "become familiar" is first recorded 1850. Phrase hair of the dog that bit you (1540s), homeopathic remedy, is in Pliny.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for 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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for not turn a hair

hair

[ hâr ]

One of the fine strands that grow from the skin of mammals, usually providing insulation against the cold. Modified hairs sometimes serve as protective defenses, as in the quills of a porcupine or hedgehog, or as tactile organs, as in the whiskers (called vibrissae) of many nocturnal mammals. Hair filaments are a modification of the epidermis of the skin and are composed primarily of keratin. Hair also contains melanin, which determines hair color.
A slender growth resembling a mammalian hair, found on insects and other animals.
A fine, threadlike growth from the epidermis of plants. See more at trichome.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with not turn a hair (1 of 2)

not turn a hair


see turn a hair.

Idioms and Phrases with not turn a hair (2 of 2)

hair


In addition to the idioms beginning with hair

  • hair of the dog that bit you
  • hair shirt

also see:

  • bad hair day
  • by a hair
  • by the short hairs
  • fair-haired boy
  • get gray hair from
  • hang by a thread (hair)
  • hide or hair
  • in someone's hair
  • let one's hair down
  • make one's hair stand on end
  • put lead in one's pencil (hair on one's chest)
  • split hairs
  • tear one's hair
  • turn a hair
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.