The term 'Pelvis Portion' is a reference to the HIPBONE, which is a 7-letter word. The HIPBONE is part of the pelvic girdle, which is a group of bones that form the pelvis. It is composed of three bones: the ilium, ischium, and pubis. The HIPBONE is connected to the sacrum and the coccyx, which together form the bony pelvis. The HIPBONE is important for providing stability and support for the body, as well as for movement.