incest
Word family adjectiveincestuousadverbincestuouslynounincestuousnessincest
in·cest /ˈɪnsest/ noun [uncountableU] SYSEX/HAVE SEX WITHsex between people who are closely related in a family 乱伦 Abortions would only be allowed in cases of rape or incest. 只有被强奸或乱伦受孕才允许堕胎。
Origin incest (1200-1300) Latin incestum, from castus “pure”; → CHASTE