Hair-cut, 1887, "act of cutting the hair," from hair (n.) + cut (n.). As "style of wearing the hair," by 1890.

The Romans began to cut the hair about A.U.C. 454, when Ticinius Maenas introduced Barbers from Sicily. Then they began to cut, curl, and perfume it. The glass was consulted as now upon rising from the barber's chair. [Rev. Thomas Dudley Fosbroke, "Encyclopædia of Antiquities," London, 1825]

Old English sceafan (strong verb, past tense scof, past participle scafen), "to scrape, shave, polish," from Proto-Germanic *skaban (source also of Old Norse skafa, Middle Dutch scaven, German schaben, Gothic skaban "scratch, shave, scrape"), from PIE *skabh-, collateral form of root *(s)kep-"to cut, to scrape, to hack" (see scabies). Related: Shaved; shaving. Original strong verb status is preserved in past tense form shaven. Specifically in reference to cutting the hair close from mid-13c. Figurative sense of "to strip (someone) of money or possessions" is attested from late 14c.

1580s, from French moustache (15c.), from Italian mostaccio, from Medieval Greek moustakion, diminutive of Doric mystax (genitive mystakos) "upper lip, mustache," related to mastax "jaws, mouth," literally "that with which one chews," from PIE root *mendh- "to chew" (see mandible).

Borrowed earlier (1550s) as mostacchi, from the Italian word or its Spanish derivative mostacho. The plural form of this, mustachios, lingers in English. Slang shortening stache attested from 1985.

"close growth of hair on the chin and lower face, normally characteristic of an adult male" (that of the upper lip being distinguished in Modern English as the mustache), Old English beard "beard," from West Germanic *barthaz (source also of Old Frisian berd, Middle Dutch baert, Old High German bart, German bart), seemingly from PIE root *bhardhā- "beard" (source also of Old Church Slavonic brada, Russia boroda, Lithuanian barzda, Old Prussian bordus, and perhaps Latin barba "beard"). Old French berd is from Germanic.

1560s, "conduct or behavior toward someone or something," from treat (v.) + -ment. In the medical sense, it is first recorded 1744.

1762, "to massage," from Anglo-Indian shampoo, from Hindi champo, imperative of champna "to press, knead the muscles," perhaps from Sanskrit capayati "pounds, kneads." Meaning "wash the hair" first recorded 1860; extended 1954 to carpets, upholstery, etc. Related: Shampooed; shampooing.