IPA: /əˈdʌltərɛs/
KK: /əˈdʌltərəs/
A woman who is unfaithful to her spouse by having a romantic or sexual relationship with someone else.
The novel's protagonist was an adulteress, struggling with the consequences of her actions.
Adulteress → It is formed from "adulterare" (meaning to corrupt or make impure) and the suffix "-ess" (meaning a female). The word refers to a woman who engages in sexual relations outside of marriage, thus corrupting the sanctity of the marital bond.
Think of a woman who 'corrupts' the marital bond ('adulterare') — that's why an adulteress is a woman who is unfaithful in marriage.