Dictionary.net

The property that remains in a deceased person's estate after all specific gifts are made, and all debts, taxes, administrative fees, probate costs, and court costs are paid. The residuary estate also includes any gifts under a will that fail or lapse. For example, Connie's will leaves her house and all its furnishings to Andrew, her VW bug to her friend Carl, and the remainder of her property (the residuary estate) to her sister Sara. She doesn’t name any alternate beneficiaries. Carl dies before Connie. The VW bug becomes part of the residuary estate and passes to Sara, along with all of Connie's property other than the house and furnishings. Also called the residual estate or residue.