• n. 亂倫；近親通婚

in-,不，非，-cest,純的，詞源同caste,castrate.即不純潔的，引申詞義亂倫。

incest

incest: [13] Etymologically, incest is virtually the same word as unchaste. It was borrowed from Latin incestus, a noun use of an adjective formed from the negative prefix in- and castus ‘pure’ (source of English chaste). The Latin word denoted ‘unchastity’ in general, but in practice was often applied specifically to ‘sexual contact between close relatives’.
=> chaste

incest (n.)

c. 1200, "the crime of sexual intercourse between near kindred," from Old French inceste and directly from Latin incestum "unchastity, impious unchastity," also specifically "sex between close relatives," noun use of neuter adjective incestus "unchaste, impure," from in- "not" (see in- (1)) + castus "pure" (see caste). In early use also in reference to sexual relations or marriage with one under a vow of chastity (sometimes distinguished as spiritual incest). Old English had sibleger "incest," literally "kin-lying."

1. Her party opposes abortion, except in cases of rape or incest.

她的黨派反對墮胎，但強奸或亂倫引起的懷孕除外。

來自柯林斯例句

2. Incest was punishable by death.

以前亂倫罪可判處死刑.

來自《簡明英漢詞典》

3. The " horror of incest " is not in fact universal.

“ 令人憎惡的亂倫 “ 實際上并不是普遍的.

來自辭典例句

4. Incest rules and rules of exogamy are related, not identical.

關于亂倫的規定和異族通婚的規定是有關聯的, 但并不是完全相同的.

來自辭典例句

5. Mother - son incest is rare and deeply pathological.

母親與兒子亂倫很少見也很病態.

來自電影對白