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incestuous (adj.)
[incestuous 词源字典]
1530s, from Latin
incestuosus
"incestuous," from
incestus
"unchaste" (see
incest
). Figurative use is from 1744. Related:
Incestuously
;
incestuousness
.
[incestuous etymology, incestuous origin, 英语词源]