Is your waist a joint

Answer 1

Yes and no, there is a joint (or joints as you have two) in your waist line called the sacroiliac joint, where your sacrum meets your ilium. Unless you've studied bones that answer might not help so... The sacrum is a bunch of fused vertebrae at the very end of your spine, its right above your tail bone, and you have an ilium on either your two innominates (which form the body of your pelvis), these ilia are more or less the part of your pelvis that you can see in your hips. Other than that the nearest joint I can think of is the joint made where the femoral head meets the acetabular fossa (the top of your legs, often called the "hip joint"). Hope this helps!

Answer 2

Yes and No, you do not have a joint you have many joints forming your wrist joint.