1.  pelvis(n = noun.body) hip, pelvic arch, pelvic girdle - the structure of the vertebrate skeleton supporting the lower limbs in humans and the hind limbs or corresponding parts in other vertebrates;
is a kind of girdle
is a part of appendicular skeleton
has parts: coccyx, tail bone, hipbone, innominate bone, ilium, ischial bone, ischium, os ischii, os pubis, pubic bone, pubis, sacrum, articulatio coxae, coxa, hip, hip joint
Derived form adjective pelvic₁

2.  pelvis(n = noun.body) renal pelvis - a structure shaped like a funnel in the outlet of the kidney into which urine is discharged before passing into the ureter;
is a kind of bodily cavity, cavity, cavum
is a part of kidney

1.  The pelvic arch, or the pelvic arch together with the sacrum. See Pelvic arch, under Pelvic, and Sacrum. [1913 Webster]

2.  The calyx of a crinoid. [1913 Webster]

pelvis, n. (pl. pelvises or pelves)
1 a basin-shaped cavity at the lower end of the torso of most vertebrates, formed from the innominate bone with the sacrum and other vertebrae.
2 the basin-like cavity of the kidney.

Etymology:
L, = basin

renal pelvis