traumatic brain injury

noun

Medical Definition of traumatic brain injury 

: an acquired brain injury caused by external force (as a blow to the head sustained in a motor vehicle accident or fall or shrapnel or a bullet entering through the skull) A soldier—or a civilian—can survive the blast without a single penetrating wound and still receive the worst diagnosis: traumatic brain injury, or TBI, the signature injury of the Iraq War.— Michael Mason, Discover, 24 Feb. 2007 An unprotected fall, especially if the player is unconscious or his opponent lands on top of him, can result in severe traumatic brain injury.— Michael J. Stuart et al., USA Today, 31 Oct. 2013 broadly : acquired brain injury abbreviation TBI

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