any of various acute viral infections, as dengue, yellow fever, or Ebola, characterized by fever, fatigue, internal bleeding, headache, etc.
See hemorrhagic fever in American Heritage Dictionary 4
noun
Any of a group of viral infections, including dengue hemorrhagic fever, Ebola virus disease, and yellow fever, that occur primarily in tropical climates, are usually transmitted to humans by arthropods or rodents, and are characterized by high fever, petechiae, internal bleeding, hypotension, and shock.