IPA: /ˈfræt.rɪˌsaɪd/
KK: /ˈfrætrɪˌsaɪd/
The act of killing one's own brother or sister, or a person with a close relationship like that of a sibling.
The war led to many tragic cases of fratricide among the soldiers.
Fratricide is formed from "frater" (meaning brother) and "-cide" (from Latin "caedere", meaning to kill). The word refers to the act of killing one's brother.
Think of the word 'frater' for brother and '-cide' for killing — that's why fratricide means the act of killing a brother.