Ictus sanguinis is a Latin term that means "stroke of blood." It is often used to refer to a sudden change in a person's behavior or personality due to a genetic or familial trait. However, there are many synonyms for this term that can be used to describe this phenomenon. Some common alternatives include bloodline influence, hereditary impact, familial imprint, genetic legacy, and ancestral mark. Each of these words helps to encapsulate the idea of a person's behavior being influenced by their genetic makeup or familial history. By using synonyms, writers can add nuance and specificity to their descriptions of this complex concept.