Etymology
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Peking 

former transliteration of the name of the Chinese capital city, now (in the pinyin system) called Beijing. In the Wade-Giles system it was Peiping; the form Peking pre-dates Wade-Giles and was formed by the old British-run, Hong Kong-based Chinese postal system. Peking duck, "large domestic duck of white plumage and orange beak and legs," is attested from 1880.

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circuitry (n.)

"plan or system of electrical circuits," 1946, from circuit (n.)+ -ry.

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neuroscience (n.)

"scientific study of the nervous system," 1963, from neuro- + science.

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fanboy (n.)
"young male enthusiast," by 1988, from fan (n.2) + boy. Fangirl attested from 1989.
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ethane (n.)
1873, from ethyl + -ane, the appropriate suffix under Hofmann's system.
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protectionism (n.)

"doctrine or system of protection in political economy," 1846, from protectionist + -ism.

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well-hung (adj.)
1610s, in male genital sense, from well (adv.) + hung (adj.).
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p.a. (n.)

abbreviation of public address (system), attested from 1936.

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componentry (n.)

"component parts of a device or system," 1956, from component + -ry.

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Xerxes 
king of Persia who reigned 486-465 B.C.E., Greek Xerxes, from Old Persian Xšayaršan, literally "male (i.e. 'hero') among kings," from Xšaya- "to rule over" (see shah) + aršan "male, man, hero." The Hebrew rendition was Ahashwerosh, Ahashresh.
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