1. To cut off from an inheritance or from hereditary succession; to prevent, as an heir, from coming into possession of any property or right, which, by law or custom, would devolve on him in the course of descent. Of how fair a portion adam disinherited his whole posterity! (South)
2. To deprive of heritage; to dispossess. And disinherit chaos, that reigns here. (Milton)
Origin: cf. Disherit, Disheir.