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

• helplessnesses
• helpline
• helplines
• helpmate
• helpmates
• helpmeet
• helpmeets
• help off with
• help oneself
• help oneself to
• help on with
• help out
• helps
• helter-skelter
• helter-skelteriness
• helter-skelters
• helve
• helved
• helve-hammer
• helve-hammers
• helves
• Helvetian
• Helvetic
• Helvetic Confessions
• helvetium