IPA: //ˈmɜːrdərəs//
KK: /ˈmɜrdərɪs/
A woman who kills someone intentionally and unlawfully.
The murderess was sentenced to life in prison for her crime.
Murderess → It is formed from "murder" (from Old French *murder*, meaning unlawful killing) and "-ess" (a suffix used to denote a female). The word "murderess" specifically refers to a female who commits murder.
Think of the word 'murder' which means unlawful killing, and the suffix '-ess' indicates a female. So, a murderess is a woman who commits murder.