pelvis of the kidney

from The Collaborative International Dictionary of English v.0.48

Pelvis \Pel"vis\, n. [L., a basin, laver; cf. Gr. ?, ?, bowl.]
   1. (Anat.) The pelvic arch, or the pelvic arch together with
      the sacrum. See {Pelvic arch}, under {Pelvic}, and
      {Sacrum}.
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   2. (Zool.) The calyx of a crinoid.
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   {Pelvis of the kidney} (Anat.), the basinlike cavity into
      which the ureter expands as it joins the kidney.
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