The medical term you're looking for is "sacroiliac." It refers to the junction between the sacrum and ilium bones in the pelvis.
Lightening is the medical term meaning descent of the baby into the pelvis.
pyel/o is the medical terminology combining form meaning renal pelvis
A pelvimeter is an instrument for measuring the pelvis.
Pelvis is the name of the part but a combining form for it would be Pelv-ic. pelv means pelvis and -ic means pertaining to. all together it would mean pertaining to the pelvis.
The abdomen is higher on the body. It is the area between your chest and pelvis. It is where your abs are located. The hip is around the pelvis.
The femur is the thigh bone.FemurfemurThe thigh bone is known as the femur. It extends from the pelvis to the knee and it is the longest and strongest bone in the body.
Ascites is the accumulation of free fluid in the abdomen and pelvis. It is usually the result of trauma or some disease process.
renal calculi
Pyelostomy is surgical creation of an artificial opening into the renal pelvis
Abdomen
Tumors in the pelvis and abdomen may result in plexopathies and pain in the lumar, sacral (lumbosacral) plexi with pain experienced in the abdomen and upper regions of the leg