The term "fratricidal" is an adjective that describes something related to the killing or destruction of one's own brother or sister. However, the term is often used more broadly to describe any situation in which members of a group or organization harm or destroy each other, whether literally or metaphorically. For example, "fratricidal conflict" refers to a conflict between members of the same group or organization, while "fratricidal criticism" refers to criticism from within a group that undermines the group's unity or goals.