Definitions for king-size
Random House Webster's College Dictionary
larger or longer than the usual size.
Category: Common Vocabulary
(of a bed) extra large, usu. 76–78 in. (193–198 cm) wide and 80–84 in. (203–213 cm) long.
of or for a king-size bed.
Category: Common Vocabulary, Furniture
Origin of king-size:
"a king-size bed"