1. A bodily injury resulting from a blow with a blunt object. This causes damage to subcutaneous tissue and the associated blood vessels, and an escape of blood. The visible result is black, purple, yellow, and/or blue discoloration of the skin, swelling, and painful tenderness in the affected areas. Appropriate treatment is ice and possibly aspirin or ibuprofin to reduce swelling.
2. A severe concussion of the brain, resulting in damage to brain tissue and blood vessels. May cause no end of trouble, generally causing unconsciousness and other potentially permanent brain damage.

Dictionary of Sexology Project: Main Index

Con*tu"sion (?), n. [L. contusio: cf. F. contusion.]

1.

The act or process of beating, bruising, or pounding; the state of being beaten or bruised.

2. Med.

A bruise; an injury attended with more or less disorganization of the subcutaneous tissue and effusion of blood beneath the skin, but without apparent wound.

© Webster 1913.