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euthanasia [euthanasia 词源字典]: euthanasia: [17] Etymologically, euthanasia means ‘good death’, and that was more or less its signification when it was introduced into English: ‘Give me but gentle Death: Euthanasia, Euthanasia, that is all I implore’, Tatler 1709. The modern use of the word, ‘mercy killing’, seems to have originated in the 1860s; the first recorded use of it was by William Lecky in his History of European morals 1869. The term is borrowed from Greek euthanasíā, a compound based on the prefix eu- ‘good’ and thánatos ‘death’.
[euthanasia etymology, euthanasia origin, 英语词源]
gymnasium: gymnasium: [16] Greek gumnós meant ‘naked’. It was customary in ancient times for athletes to train naked, and so the verb gumnázein came to mean ‘train, practise’ – particularly by doing exercises (whence English gymnast [16]). From the verb was derived the noun gumnásion, which Latin borrowed as gymnasium ‘school’. This academic sense has never caught on to any extent in English (although it is the word’s only application in German); we have preferred to go back to the original athletic connotations.
Athanasian (adj.): 1580s, from Athanasius, archbishop of Alexandria in the reign of Constantine. The name is Latin, from Greek Athanasios, from athanatos "immortal," from a- "not," privative prefix, + thanatos "death" (see thanatology).
euthanasia (n.): 1640s, "a gentle and easy death," from Greek euthanasia "an easy or happy death," from eu- "good" (see eu-) + thanatos "death" (see thanatology) + abstract noun ending -ia. Slightly earlier in anglicized form euthanasy (1630s). Sense of "legally sanctioned mercy killing" is recorded in English by 1869.
gymnasium (n.): 1590s, "place of exercise," from Latin gymnasium "school for gymnastics," from Greek gymnasion "public place where athletic exercises are practiced; gymnastics school," in plural, "bodily exercises," from gymnazein "to exercise or train," literally or figuratively, literally "to train naked," from gymnos "naked," from a metathesis of PIE *nogw-mo-, suffixed form of *nogw- "naked" (see naked).

A feature of all ancient Greek communities, at first it was merely an open space, later with extensive facilities and including training for the mind as well as the body. Hence its use in German from 15c. as a name for "high school" (more or less paralleling a sense also in Latin); in English it has remained purely athletic. For the "continental high school sense," English in 19c. sometimes used gymnastical as an adjective, gymnasiast for a student.
active euthanasia: "The ending of a terminally ill person's life by direct intervention, such as administering a lethal dose of painkilling drugs", 1950s; earliest use found in University of Pennsylvania Law Review.