Pelvis /(?)/

Pel·vis

Pelvis

n.
  1. The pelvic arch, or the pelvic arch together with the sacrum. See Pelvic arch, under Pelvic, and Sacrum. (Anat.)
  2. The calyx of a crinoid. (Zool.)

Phrases & Compounds
Pelvis of the kidney
the basinlike cavity into which the ureter expands as it joins the kidney.