Hematoma /(hē`mȧ*tō"mȧ [or] hĕm`ȧ*tō"mȧ)/

Hem·a·to·ma

Hematoma

n.
  1. A localised leakage of blood from the blood vessels into nearby tissues, usually confined within a tissue or organ; especially, a local swelling produced by an effusion of blood beneath the skin, which may clot and discolor the affected area. (Med.)