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Greek (adj.)[Greek 词源字典]: late 14c., "of Greece or its people," from Greek (n.). Earlier Gregeis (c. 1200), from Old French Gregois; also Greekish (Old English Grecisc). From 1540s as "of the Greek language;" 1550s as "of the Eastern Church." From 1888 as "of Greek-letter fraternities." In venery, "anal," by 1970. Greek fire "inflammable substance invented 7c. by Callinicus of Heliopolis and used by the Byzantines (who in the Middle Ages were known as 'Greeks')" is from c. 1400, earlier Grickisce fure (c. 1200). Greek gift is from "Æneid," II.49: "timeo Danaos et dona ferentes." [Greek etymology, Greek origin, 英语词源]
wildfire (n.): late Old English wilde fyr "destructive fire" (perhaps caused by lightning); also "erysipelas, spreading skin disease;" see from wild (adj.) + fire (n.). From c. 1300 as "Greek fire," also fire rained down from the sky as divine retribution. Figurative sense from late 14c. By 1795 as "sheet lightning."