英语词源字典 - 在线词源网站

dangerous (adj.)[dangerous 词源字典]: early 13c., "difficult, arrogant, severe" (the opposite of affable), from Anglo-French dangerous, Old French dangeros (12c., Modern French dangereux), from danger (see danger).

In Chaucer, it means "hard to please, reluctant to give;" sense of "full of danger, risky" is from late 15c. Other words used in this sense included dangersome (1560s), dangerful (1540s). Related: Dangerously.[dangerous etymology, dangerous origin, 英语词源]
Geronimo (interj.): cry made in jumping, 1944 among U.S. airborne soldiers, apparently from the story of the Apache leader Geronimo making a daring leap to escape U.S. cavalry pursuers at Medicine Bluffs, Oklahoma (and supposedly shouting his name in defiance as he did). Adopted as battle cry by paratroopers in World War II, who perhaps had seen it in the 1939 Paramount Studios movie "Geronimo." The name is the Italian and Spanish form of Jerome, from Greek Hieronomos, literally "sacred name." One contemporary source also lists Osceola as a jumping cry.
gerontocracy (n.): "rule by old men," 1830, a Latinized compound of Greek stem of geron (genitive gerontos) "old man" (see gerontology) + kratia "rule" (see -cracy). Related: Gerontocratic.
gerontologist (n.): 1941, from gerontology + -ist.
gerontology (n.): 1903, coined in English from geronto-, used as comb. form of Greek geron (genitive gerontos) "old man," from PIE root *gere- "to become ripe, grow old" (cognates: Sanskrit jara "old age," jarati "makes frail, causes to age;" Avestan zaurvan "old age;" Ossetic zarond "old man;" Armenian cer "old, old man").
hedgerow (n.): Old English hegeræw; see hedge (n.) + row (n.).
longeron (n.): 1912, from French longeron, from longer "to skirt, extend along," from allonger "to lengthen" (see lunge).