Dictionary.net

A fracture, contusion, or injury, produced, by a blow, in a part distant from that which is struck. Five species of contrafissurae or contre-coups may occur in the skull. 1. When the internal table yields and fractures. 2. When the bone breaks in any other part than the one struck. 3. When a bone, which has been struck, remains uninjured, and its neighbour is fractured. 4. When the bone is fractured in a place diametrically opposite to that struck, as in fractures at the base of the cranium, from a fall on the vertex; and lastly, when the violence of the blow produces a separation of the neighbouring or distant sutures. These fractures of the skull are also called Fractures par resonnance.