Words related to holy

health (n.)

Old English hælþ "wholeness, a being whole, sound or well," from Proto-Germanic *hailitho, from PIE *kailo- "whole, uninjured, of good omen" (source also of 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.

halibut (n.)
large flatfish, early 15c., perhaps from hali "holy" (see holy) + butte "flatfish" (see butt (n.4)). Supposedly so called from its being eaten on holy days (compare cognate Dutch heilbot, Low German heilbutt, Swedish helgeflundra, Danish helleflynder).
island in the North Sea off Germany, from the same source as German heilig "holy" (see holy), in reference to an ancient shrine there.
holiday (n.)
1500s, earlier haliday (c. 1200), from Old English haligdæg "holy day, consecrated day, religious anniversary; Sabbath," from halig "holy" (see holy) + dæg "day" (see day); in 14c. meaning both "religious festival" and "day of exemption from labor and recreation," but pronunciation and sense diverged 16c. As an adjective mid-15c. Happy holidays is from mid-19c., in British English, with reference to summer vacation from school. As a Christmastime greeting, by 1937, American English, in Camel cigarette ads.
holily (adv.)
c. 1200, from holy (adj.) + -ly (2).
holiness (n.)
Middle English holinesse, from Old English halignis "state or character of being holy, sanctity, religion; holy thing;" see holy + -ness. Compare Old High German heilagnissa. As title of the Pope (mid-15c. in English), it translates Latin sanctitas (until c. 600 also applied to bishops).
hollyhock (n.)
mid-13c., holihoc, probably from holi "holy" (see holy) + hokke "mallow," from Old English hocc, a word of unknown origin. Another early name for the plant was caulis Sancti Cuthberti "St. Cuthbert's cole." Native to China and southern Europe, the old story is that it was so called because it was brought from the Holy Land.
unholy (adj.)
Old English unhalig, "impious, profane, wicked," from un- (1) "not" + halig (see holy). Similar formation in Middle Dutch onheilich, Old Norse uheilagr, Danish unhellig, Swedish ohelig. In reference to actions, it is attested from late 14c. Colloquial sense of "awful, dreadful" is recorded from 1842.