What is the medical term for a nosebleed?

The term for a nosebleed is "epistaxis." This medical term specifically denotes the bleeding that originates from the nostrils or nasal cavity. It can occur due to various reasons, including environmental factors, trauma, or medical conditions. Understanding the correct terminology is crucial in medical settings, as it allows healthcare professionals to communicate clearly about symptoms and conditions.

The other terms listed refer to different medical conditions: myocardial infarction relates to a heart attack, emesis refers to vomiting, and hemorrhage indicates bleeding in general, which could occur anywhere in the body. Thus, while they are all relevant medical terms, only "epistaxis" specifically describes a nosebleed.