contrecoup

n.

[F., fr. contre (L. contra) + coup a blow.]
(med.) A concussion or shock produced by a blow or other injury, in a part or region opposite to that at which the blow is received, often causing rupture or disorganisation of the parts affected.

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(kŏn'trə-kū')
n.

Injury to a part opposite the site of the primary injury, as an injury to the skull opposite the site of a blow.

[Fr.] denoting an injury, as to the brain, occurring at a site opposite to the point of impact. See also coup.

IN BRIEF: n.-Injury of one part of an organ (as the brain) as a result of the transmitted shock from a blow on the opposite side.