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bastard [bastard 词源字典]: bastard: [13] The idea underlying the word bastard appears to be that of a child born of an impromptu sexual encounter on an improvised bed, for it seems to echo Old French fils de bast, literally ‘packsaddle son’, that is, one conceived on a packsaddle pillow. If this is the case, the word goes back to medieval Latin bastum ‘packsaddle’, whose ultimate source was Greek bastázein ‘carry’; this passed via Old French bast, later bat, into late Middle English as bat, which now survives only in batman [18].

The derived form is first found in medieval Latin as bastardus, and this reached English via Old French bastard. Its modern usage as a general term of abuse dates from the early 19th century.
=> batman[bastard etymology, bastard origin, 英语词源]
bastard (n.): "illegitimate child," early 13c., from Old French bastard (11c., Modern French bâtard), "acknowledged child of a nobleman by a woman other than his wife," probably from fils de bast "packsaddle son," meaning a child conceived on an improvised bed (saddles often doubled as beds while traveling), with pejorative ending -art (see -ard). Alternative possibly is that the word is from Proto-Germanic *banstiz "barn," equally suggestive of low origin.

Not always regarded as a stigma; the Conqueror is referred to in state documents as "William the Bastard." Figurative sense of "something not pure or genuine" is late 14c.; use as a vulgar term of abuse for a man is attested from 1830. As an adjective from late 14c. Among the "bastard" words in Halliwell-Phillipps' "Dictionary of Archaic and Provincial Words" are avetrol, chance-bairn, by-blow, harecoppe, horcop, and gimbo ("a bastard's bastard").
demi-monde (n.): 1855, also demimonde, from French demi-monde "so-so society," literally "half-world," from demi- "half" + monde, from Latin mundus "world" (see mundane).

Popularized by use as title of a comedy by Alexandre Dumas fils (1824-1895). Dumas' Demi-Monde "is the link between good and bad society ... the world of compromised women, a social limbo, the inmates of which ... are perpetually struggling to emerge into the paradise of honest and respectable ladies" ["Fraser's Magazine," 1855]. Not properly used of courtesans. Compare 18th-century English demi-rep (1749, the second element short for reputation), defined as "a woman that intrigues with every man she likes, under the name and appearance of virtue ... in short, whom every body knows to be what no body calls her" [Fielding].
fitz (n.): Anglo-French fitz, from Old French fils, from Latin filius "son of" (see filial); used regularly in official rolls and hence the first element of many modern surnames; in later times used of illegitimate issue of royalty.