Which term describes an injury characterized by the accumulation of blood?

The term that best describes an injury characterized by the accumulation of blood is hematoma. A hematoma refers to a localized collection of blood outside of blood vessels, typically due to injury or trauma, where the blood pools and accumulates in the tissues, often leading to swelling and discoloration.

While other terms related to blood and injury are mentioned, they have different specific meanings. Hemorrhage refers to blood loss from the circulatory system and doesn't inherently indicate accumulation in one area. Contusion, which is also known as a bruise, involves injury to blood vessels that causes bleeding under the skin, but it does not specifically denote a significant buildup of blood as seen in a hematoma. Cyanosis, on the other hand, describes a bluish discoloration of the skin due to inadequate oxygen levels in the blood, not related to the accumulation of blood. Therefore, hematoma is the most accurate term for the described injury.