Definitions for "Cavity back"
A newer design of irons where the back of the clubhead is hollowed out.
An iron head with the weight is distributed toward the perimeter of the head. Cavity back irons are easily identified by their recessed area on the back of the head.
The design of an iron head in which the weight is distributed toward the perimeter of the head. Cavity backs are easily identified as having a recessed area on the back of the head.