WordNet

filamentous hairlike growth on a plant; "peach fuzz" (同)fuzz, tomentum
a filamentous projection or process on an organism
any of the cylindrical filaments characteristically growing from the epidermis of a mammal; "there is a hair in my soup" (同)pilus
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; "he combed his hair"; "each hair consists of layers of dead keratinized cells"
of or relating to the armpit; "axillary gland"
of or relating to the axil (同)alar

PrepTutorEJDIC

〈C〉(人間・動物の1本の)『毛』;(植物・昆虫などの)毛 / 〈U〉《集合的に》『髪の毛』,毛,毛髪;(動物の)体毛 / 《a~》1本の毛ほどの量(距離,程度),ごくわずか
おや,はああ,ああ(驚き・喜び・疑い・ためらいなどを表す声)
hectare; hectares

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/10/15 23:22:59」(JST)

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Underarm hair, also known as, axillary hair and armpit hair, is the hair in the underarm area (axilla).

Development and function

Underarm hair, as human body hair, normally starts to appear at the beginning of puberty, with growth usually completed by the end of the teen-age years. The evolutionary significance of human underarm hair is still debated. It may naturally wick sweat or other moisture away from the skin, aiding ventilation. Colonization by odor-producing bacteria is thereby transferred away from the skin (see skin flora).^[1]

Male axilla with hair

Female axilla with hair

Cultural attitudes

Today in much of the Western world, it is more common for women to regularly shave their underarm hair, but this practice is uncommon among men. The prevalence of this practice varies widely, though. Religious reasons are sometimes cited; for example, in Islamic culture, both men and women remove underarm hair to meet religious guidelines of cleanliness. Removal of underarm hair was part of a collection of hygienic or cosmetic practices recommended by Muhammad (570-632) as consistent with fitra for both women and men and has since usually been regarded as a requirement by most Muslims.^[2] In much of the Western world, men also choose to remove their underarm hair for aesthetic reasons.

Many competitive swimmers remove nearly all of their body hair, including their underarm hair, to make their bodies more streamlined during races. Many male bodybuilders also remove their body hair for cosmetic purposes, as do many (but not all) models in various kinds of erotica.

Seneca the Younger suggests it was common practice in ancient Rome : «One is, I believe, as faulty as the other: the one class are unreasonably elaborate, the other are unreasonably negligent; the former depilate the leg, the latter not even the armpit» (letter 114).

In the West, the practice began for cosmetic reasons around 1915 in the United States and United Kingdom, when one or more magazines showed a woman in a dress with shaved underarms. Regular shaving became feasible with the introduction of the safety razor at the beginning of the 20th century. While underarm shaving was quickly adopted in some English speaking countries, especially in the US and Canada, it did not become widespread in Europe until well after World War II.^[3]^[4]

In 2015, dyeing armpit hair became a fashion trend with a feminist component in the U.S.^[5]^[6]

In art

In works of art, the underarm hair is usually removed; showing it is a mark of modernism.^{[citation needed]} This contrasts to the depiction of pubic hair in art, which is rarely portrayed in works created in the Middle Ages, increasingly common in Renaissance art, and quite frequent in modern times.^[7]

References

^ Paye, Marc; Maibach, Howard I.; Barel, André O (2009). Handbook of cosmetic science and technology (3 ed.). Informa Health Care. p. 703. ISBN 1-4200-6963-2.
^ "Compendium of Islamic Texts". USC. Retrieved 24 March 2012. ^{[dead link]}
^ Hope, Christine (1982). "Caucasian Female Body Hair and American Culture". Journal of American Culture 5 (1): 93–99. doi:10.1111/j.1542-734X.1982.0501_93.x.
^ Adams, Cecil (1991-02-06). "Who decided women should shave their legs and underarms?". The Straight Dope. Retrieved 2015-01-22.
^ Andrew Adam Newman (July 14, 2015). "Women Who Dye Their (Armpit) Hair". The New York Times.
^ http://www.freeyourpits.com/
^ Weekes, Ann Owens (1993). "Students' Self-Image: Representations of Women in "High" Art and Popular Culture". Woman's Art Journal 13 (2): 32–38. doi:10.2307/1358151.

Hair

UpToDate Contents

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1. 脱毛の評価および診断 evaluation and diagnosis of hair loss
2. 無駄毛の除毛 removal of unwanted hair
3. 休止期脱毛 telogen effluvium
4. 男性型多毛症の治療 treatment of hirsutism
5. 女性型脱毛症（女性のアンドロゲン性脱毛症）：治療および予後 female pattern hair loss androgenetic alopecia in women treatment and prognosis

English Journal

Graham-Little Piccardi Lassueur Syndrome: case report.

Steglich RB, Tonoli RE, Pinto GM, Müller FM, Guarenti IM, Duvelius ES.SourceDermatology Service, Charity Hospital of Porto Alegre, Porto Alegre, RS, Brazil.
Anais brasileiros de dermatologia.An Bras Dermatol.2012 Oct;87(5):775-7.
A 33-year-old woman presented with a 3-year history of progressive alopecia of the scalp. Past treatment with hydroxicloroquine did not show improvement. Physical examination revealed multiple areas of alopecia with atrophic aspect of the scalp, and axillary and pubic hypotrichosis. Dermoscopy showe
PMID 23044575

Axillary skin: biology and care.

Evans RL, Marriott RE, Harker M.SourcePort Sunlight Laboratory, Unilever Research and Development, Quarry Road East, Bebington, Wirral, CH63 3JW, U.K.
International journal of cosmetic science.Int J Cosmet Sci.2012 Oct;34(5):389-95. doi: 10.1111/j.1468-2494.2012.00729.x. Epub 2012 Jun 27.
In skin care, the axilla is a biologically unique site requiring specialized attention and care. This area of skin is often subject to hair removal techniques, such as shaving and plucking. These procedures damage the skin leading to erythema and dryness in the short term, and in some cases, post-in
PMID 22612735

Japanese Journal

A Novel Mutation of Androgen Receptor Gene in Complete Androgen Insensitivity Syndrome

Narumi Satoshi,Amano Naoko,Hachiya Rumi,Ishii Tomohiro,Hasegawa Tomonobu
Clinical pediatric endocrinology 16(2), 59-61, 2007-04
NAID 110006794344

Giant Intrasellar Arachnoid Cyst Manifesting as Adrenal Insufficiency Due to Hypothalamic Dysfunction : Case Report

YASUDA Keitaro,SAITOH Youichi,OKITA Kohei,MORRIS Shayne,MORIWAKI Makoto,MIYAGAWA Jun-ichiro,YOSHIMINE Toshiki
Neurologia medico-chirurgica 45(3), 164-167, 2005-03-15
… A 67-year-old man first noticed loss of pubic and axillary hair in 1992 and then a visual field defect in 2001. …
NAID 110002283574