pelvis
n.the large, bowl-shaped group of bones at the bottom of your torso. It connects your spine to your legs and supports your internal organs.
n.the large, basin-shaped bony structure at the base of the vertebral column that connects the trunk to the lower limbs. It consists of the hip bones, sacrum, and coccyx.
“He suffered a fractured pelvis after falling off his bike.”
“The doctor examined the X-ray to check if the patient's pelvis was aligned correctly after the accident.”
“Forensic anthropologists often examine the width and shape of the pelvis to determine the biological sex of skeletal remains, as these features vary significantly between males and females.”
The plural form is 'pelvises' or the Latin 'pelves'.
“Soon afterward, he swerved to avoid a truck and flipped the vehicle, which landed on top of him, crushing his pelvis.”
From Latin pēlvis (“basin”), from Old Latin pēluis (“basin”), further etymology uncertain.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.