Machiavellian (adj.)youdaoicibaDictYouDict[Machiavellian 词源字典]
"cunning, deceitful, unscrupulous," 1570s, from Niccolo Machiavelli (1469-1527), Florentine statesman and author of "Il Principe," a work advising rulers to place advantage above morality. A word of abuse in English well before his works were translated ("The Discourses" 1636, "The Prince" 1640), in part because his books were Indexed by the Church, in part because of French attacks on him (such as Gentillet's, translated into English 1602).[Machiavellian etymology, Machiavellian origin, 英语词源]
oxygen (n.)youdaoicibaDictYouDict
gaseous chemical element, 1790, from French oxygène, coined in 1777 by French chemist Antoine-Laurent Lavoisier (1743-1794), from Greek oxys "sharp, acid" (see acrid) + French -gène "something that produces" (from Greek -genes "formation, creation;" see -gen).

Intended to mean "acidifying (principle)," it was a Greeking of French principe acidifiant. So called because oxygen was then considered essential in the formation of acids (it is now known not to be). The element was isolated by Priestley (1774), who, using the old model of chemistry, called it dephlogisticated air. The downfall of the phlogiston theory required a new name, which Lavoisier provided.
princess (n.)youdaoicibaDictYouDict
late 14c., "woman of royal or noble birth; daughter or wife of a ruler or prince; female ruler," a native formation, or else from Old French princesse, fem. of prince (see prince). Compare Medieval Latin principissa, Italian principessa. As a colloquial form of address to a woman or girl, it is recorded from 1924 (as a term of address to a lover, early 15c.).
principle (n.)youdaoicibaDictYouDict
late 14c., "origin, source, beginning; rule of conduct; axiom, basic assumption; elemental aspect of a craft or discipline," from Anglo-French principle, Old French principe "origin, cause, principle," from Latin principium (plural principia) "a beginning, commencement, origin, first part," in plural "foundation, elements," from princeps (see prince). Used absolutely for (good or moral) principle from 1650s.
It is often easier to fight for principles than to live up to them. [Adlai Stevenson, speech, New York City, Aug. 27, 1952]
Scientific sense of "general law of nature" is recorded from 1802. The English -l- apparently is by analogy of participle, etc.