The term "fratricide" is derived from Latin, where "frater" means brother and "-cide" refers to the act of killing. Therefore, fratricide refers to the act of killing one's brother. This is a specific term used to describe this particular act, similar to other terms like "patricide" (killing of one's father) or "suicide" (killing of oneself).
Let's analyze the options one by one:
Hence, the correct answer is "murder of brother."

Pick the appropriate meaning of the term 'proscribe' used in the following sentence :-'Arms culture should be proscribed by the government.'