Source : WordNet®

pelvis
     n 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)]

pelves
     See {pelvis}