headroom (n.)youdaoicibaDictYouDict[headroom 词源字典]
"space above the head," 1851, from head (n.) + room (n.).[headroom etymology, headroom origin, 英语词源]
heads-up (adj.)youdaoicibaDictYouDict
"clever, alert," 1926, from warning cry "heads up!" (i.e. "look up!"). As a noun, "a notification, a warning," by 1988.
headsman (n.)youdaoicibaDictYouDict
"executioner," c. 1600, from genitive of head (n.) + man (n.). Used earlier in sense "chief, leader" (c. 1400).
headstone (n.)youdaoicibaDictYouDict
c. 1400, "cornerstone," from head (adj.) + stone (n.). Meaning "upright stone at the head of a grave" is 1775, from head (n.).
headstrong (adj.)youdaoicibaDictYouDict
"determined to have one's way," late 14c., from head (n.) + strong. Compare Old English heafodbald "impudent," literally "head-bold." Strongheaded is attested from c. 1600.
headwaters (n.)youdaoicibaDictYouDict
attested 1530s, then not again until 1792 (in descriptions of Kentucky), so possibly the modern word is a re-formation; see head (n.) "origin of a river" + water (n.1).
headway (n.)youdaoicibaDictYouDict
c. 1300, "main road, highway," from Old English heafodweg; see head (adj.) + way (n.). Sense of "motion forward" first attested 1748, short for ahead-way; ultimately nautical (compare leeway).
heady (adj.)youdaoicibaDictYouDict
late 14c., "headstrong, hasty, impetuous," from head (n.) + adj. suffix -y (2). First recorded 1570s in sense of "apt to go to the head." Related: Headily; headiness.
heal (v.)youdaoicibaDictYouDict
Old English hælan "cure; save; make whole, sound and well," from Proto-Germanic *hailjan (cognates: Old Saxon helian, Old Norse heila, Old Frisian hela, Dutch helen, German heilen, Gothic ga-hailjan "to heal, cure"), literally "to make whole," from PIE *kailo- "whole" (see health). Intransitive sense from late 14c. Related: Healed; healing.
heal-all (n.)youdaoicibaDictYouDict
1570s, "universal remedy," from heal + all; applied since 1814 to various plants supposed to possess healing virtues. The native word for panacea.
healer (n.)youdaoicibaDictYouDict
late Old English, "one who heals," especially "savior, Jesus," agent noun from heal (v.). As "a curative medicine" from late 14c. The usual Old English noun for Jesus as savior was hæland (Middle English healend), a noun use of a present participle, being a rough translation of the name (see Joshua) or of Latin salvator.
healing (n.)youdaoicibaDictYouDict
"restoration to health," Old English hæling, verbal noun from heal (v.). Figurative sense of "restoration of wholeness" is from early 13c.; meaning "touch that cures" is from 1670s.
health (n.)youdaoicibaDictYouDict
Old English hælþ "wholeness, a being whole, sound or well," from Proto-Germanic *hailitho, from PIE *kailo- "whole, uninjured, of good omen" (cognates: Old English hal "hale, whole;" Old Norse heill "healthy;" Old English halig, Old Norse helge "holy, sacred;" Old English hælan "to heal"). With Proto-Germanic abstract noun suffix *-itho (see -th (2)). Of physical health in Middle English, but also "prosperity, happiness, welfare; preservation, safety." An abstract noun to whole, not to heal. Meaning "a salutation" (in a toast, etc.) wishing one welfare or prosperity is from 1590s. Health food is from 1848.
health-care (n.)youdaoicibaDictYouDict
also healthcare, 1917, originally in reference to the German Empire, from health + care (n.).
healthful (adj.)youdaoicibaDictYouDict
late 14c., "wholesome, curative, saving, serving to promote health," from health + -ful. Meaning "free from disease, healthy" is attested from 1540s but is rare. Related: Healthfully; healthfulness.
healthy (adj.)youdaoicibaDictYouDict
1550s, "being in a sound state;" also "conducive to health," from health + -y (2). Earlier in the same sense was healthsome (1530s). Related: Healthily; healthiness.
It is wrong to say that certain articles of food are healthy or unhealthy. Wholesome and unwholesome are the right words. A pig may be healthy or unhealthy while alive; but after he is killed and becomes pork, he can enjoy no health, and suffer no sickness. [Eliza Leslie, "Miss Leslie's Behaviour Book," Philadelphia, 1839]
Healthsome is from 1530s in the sense "bestowing health."
heap (n.)youdaoicibaDictYouDict
Old English heap "pile (of things); great number, crowd, multitude (of persons)," from West Germanic *haupaz (cognates: Old Saxon hop, Old Frisian hap, Middle Low German hupe, Dutch hoop, German Haufe "heap"), of uncertain origin. The group is perhaps related to Old English heah "high" (see high), but OED suggests a common origin with Latin cubare "lie down." Slang meaning "old car" is attested from 1924. Earlier it meant "slovenly woman" (1806). As a characteristic word in American Indian English speech, "a lot, a great deal," by 1832.
One grain of sand does not make a heap. A second grain of sand added to the first does not make a heap. Indeed each and every grain of sand, when added to the others, does not make a heap which was not a heap before. Therefore, all the grains of sand in existence can still not a heap make. [the fallacy of the heap]
heap (v.)youdaoicibaDictYouDict
Old English heapian "collect, heap up, bring together;" from heap (n.). Related: Heaped; heaping. Compare Old High German houfon, German haufen "to heap," also a verb from a noun.
hear (v.)youdaoicibaDictYouDict
Old English heran (Anglian), (ge)hieran, hyran (West Saxon) "to hear, perceive by the ear, listen (to), obey, follow; accede to, grant; judge," from Proto-Germanic *hauzjan (cognates: Old Norse heyra, Old Frisian hora, Dutch horen, German hören, Gothic hausjan), from PIE *kous- "to hear" (see acoustic). The shift from *-z- to -r- is a regular feature in some Germanic languages.

For the vowels, see head (n.); spelling distinction between hear and here developed 1200-1550. Meaning "be told, learn by report" is from early 14c. Old English also had the excellent adjective hiersum "ready to hear, obedient," literally "hear-some" with suffix from handsome, etc. Hear, hear! (1680s) originally was imperative, an exclamation to call attention to a speaker's words ("hear him!"); now a general cheer of approval. To not hear of "have nothing to do with" is from 1754.
heardyoudaoicibaDictYouDict
past tense and past participle of hear, Old English herde. To have heard of "know about" is from 1907.