From The Collaborative International Dictionary of English v.0.44 [gcide]:
Pelvis \Pel"vis\, noun [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}.
2. (Zo["o]l.) The calyx of a crinoid.
{Pelvis of the kidney} (Anat.), the basinlike cavity into which the ureter expands as it joins the kidney.
From WordNet (r) 2.0 [wn]:
noun
1: the structure of the vertebrate skeleton supporting the lower limbs in humans and the hind limbs or corresponding parts in other vertebrates [syn: {pelvic girdle}, {pelvic arch}, {hip}]
2: a structure shaped like a funnel in the outlet of the kidney into which urine is discharged before passing into the ureter [syn: {renal pelvis}] [also: {pelves} (pl)]
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