Definitions for queen-size
Random House Webster's College Dictionary
(of a bed) larger than a double bed, but smaller than king-size, usu. 60 in. (152 cm) wide and 80 in. (203 cm) long.
of or for a queen-size bed.
of a size larger than average (often used as a euphemism).
Origin of queen-size:
(used especially of beds) not as large as king-size
"a queen-sized bed"
Pertaining to a larger-than-average dress, blouse, skirt, pant or stocking size for women
Pertaining to a bed or mattress measuring 60 inches wide by 80 inches long and approximately 9 to 12 inches thick.
If you have a queen-size bed, you'll need some queen-size sheets to go on it, and maybe a queen-size comforter as well.
Origin: queen + size