acetabulum /a-si-tabˈū-ləm or -sē-/ (zoology)

1. The hollow that receives the head of the thigh bone
2. One of the cotyledons of the placenta of ruminants
3. The cavity that receives a leg in the body of insects
4. (in various invertebrates) a sucker

acetabˈūlar adjective

• shiftier
• shiftiest
• shiftily
• shiftiness
• shiftinesses
• shifting
• shifting-boards
• shifting cultivation
• shifting register
• shiftings
• shifting spanner
• shifting spanners
• shift key
• shift keys
• shiftless
• shiftlessly
• shiftlessness
• shiftlessnesses
• shift one's ground
• shift register
• shift registers
• shifts
• shift the goalposts
• shift up
• shift work