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pelvis (n.)

"basin-like cavity formed by the bones of the pelvic girdle," 1610s, from Modern Latin, from Latin pelvis "basin, laver," Old Latin peluis "basin," from PIE *pel- "container" (source also of Sanskrit palavi "vessel," Greek pelex "helmet," pelike "goblet, bowl," Old Norse and Old English full "cup").

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Definitions of pelvis from WordNet

pelvis (n.)
the structure of the vertebrate skeleton supporting the lower limbs in humans and the hind limbs or corresponding parts in other vertebrates;
Synonyms: pelvic girdle / pelvic arch / hip
pelvis (n.)
a structure shaped like a funnel in the outlet of the kidney into which urine is discharged before passing into the ureter;
Synonyms: renal pelvis
From wordnet.princeton.edu