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Definitions of remainderman:
noun: (law) A person entitled to receive a remainder interest in any property.
noun: (law) A person entitled to the assets of a trust at the end of some specified period or after some event. For instance a man's will might put his assets into a trust with the income to go to his wife until she dies (being a life interest), at which time the capital (remainder interest) goes to their children. The children are remaindermen.