Gram.
a possessive construction consisting of a prepositional phrase with of containing a substantive in the possessive case, as of father's in He is a friend of father's. Also called double genitive .
Gram.
a possessive construction consisting of a prepositional phrase with of containing a substantive in the possessive case, as of father's in He is a friend of father's. Also called double genitive .
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012