Noun
life estate pur autre vie (plural life estates pur autre vie)
(law) An estate in land which is given by a grantor to a party only for the duration of the life of a third party, and for which ownership will revert to another upon the death of that third party.
Joe gives property "to Mike for the life of Bob"; Joe has created a life estate pur autre vie for Mike, but when Bob dies, the property automatically reverts to Joe.