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alchemy (n.)[alchemy 词源字典]: mid-14c., from Old French alchimie (14c.), alquemie (13c.), from Medieval Latin alkimia, from Arabic al-kimiya, from Greek khemeioa (found c.300 C.E. in a decree of Diocletian against "the old writings of the Egyptians"), all meaning "alchemy." Perhaps from an old name for Egypt (Khemia, literally "land of black earth," found in Plutarch), or from Greek khymatos "that which is poured out," from khein "to pour," related to khymos "juice, sap" [Klein, citing W. Muss-Arnolt, calls this folk etymology]. The word seems to have elements of both origins.
Mahn ... concludes, after an elaborate investigation, that Gr. khymeia was probably the original, being first applied to pharmaceutical chemistry, which was chiefly concerned with juices or infusions of plants; that the pursuits of the Alexandrian alchemists were a subsequent development of chemical study, and that the notoriety of these may have caused the name of the art to be popularly associated with the ancient name of Egypt. [OED]
The al- is the Arabic definite article, "the." The art and the name were adopted by the Arabs from Alexandrians and thence returned to Europe via Spain. Alchemy was the "chemistry" of the Middle Ages and early modern times; since c. 1600 the word has been applied distinctively to the pursuit of the transmutation of baser metals into gold, which, along with the search for the universal solvent and the panacea, were the chief occupations of early chemistry.[alchemy etymology, alchemy origin, 英语词源]
cheetah (n.): 1704, from Hindi chita "leopard," from Sanskrit chitraka "hunting leopard, tiger," literally "speckled," from chitra-s "distinctively marked, variegated, many-colored, bright, clear" (from PIE *kit-ro-, from root *(s)kai- (1) "bright, shining;" see shine (v.)) + kayah "body," from PIE *kwei- "to build, make" (see poet).
chit (n.1): "note," 1776, short for chitty, from Mahrati (Hindi) chitthi "letter, note," from Sanskrit chitra-s "distinctively marked" (see cheetah).
distinctive (adj.): early 15c., from Old French distinctif and directly from Medieval Latin distinctivus, from Latin distinct-, past participle of distinguere (see distinguish). Meaning "markedly individual" is from 1580s. Related: Distinctively; distinctiveness.
home (n.): Old English ham "dwelling, house, estate, village," from Proto-Germanic *haimaz (cognates: Old Frisian hem "home, village," Old Norse heimr "residence, world," heima "home," Danish hjem, Middle Dutch heem, German heim "home," Gothic haims "village"), from PIE root *tkei- "to settle, dwell, be home" (cognates: Sanskrit kseti "abides, dwells," Armenian shen "inhabited," Greek kome, Lithuanian kaimas "village;" Old Church Slavonic semija "domestic servants").
'Home' in the full range and feeling of [Modern English] home is a conception that belongs distinctively to the word home and some of its Gmc. cognates and is not covered by any single word in most of the IE languages. [Buck]
Home stretch (1841) is originally a reference from horse racing. Home base in baseball attested by 1859 (home plate by 1867; home as the goal in a sport or game is from 1778). Home economics first attested 1899. Slang phrase make (oneself) at home "become comfortable in a place one does not live" dates from 1892. To keep the home fires burning is from a song title from 1914. To be nothing to write home about "unremarkable" is from 1907. Home movie is from 1919; home computer is from 1967.
pagan (n.): late 14c., from Late Latin paganus "pagan," in classical Latin "villager, rustic; civilian, non-combatant" noun use of adjective meaning "of the country, of a village," from pagus "country people; province, rural district," originally "district limited by markers," thus related to pangere "to fix, fasten," from PIE root *pag- "to fix" (see pact). As an adjective from early 15c.

Religious sense is often said to derive from conservative rural adherence to the old gods after the Christianization of Roman towns and cities; but the word in this sense predates that period in Church history, and it is more likely derived from the use of paganus in Roman military jargon for "civilian, incompetent soldier," which Christians (Tertullian, c.202; Augustine) picked up with the military imagery of the early Church (such as milites "soldier of Christ," etc.). Applied to modern pantheists and nature-worshippers from 1908.
Pagan and heathen are primarily the same in meaning; but pagan is sometimes distinctively applied to those nations that, although worshiping false gods, are more cultivated, as the Greeks and Romans, and heathen to uncivilized idolaters, as the tribes of Africa. A Mohammedan is not counted a pagan much less a heathen. [Century Dictionary, 1902]
The English surname Paine, Payne, etc., appears by old records to be from Latin paganus, but whether in the sense "villager," "rustic," or "heathen" is disputed. It also was a common Christian name in 13c., "and was, no doubt, given without any thought of its meaning" ["Dictionary of English Surnames"].