- the socket in the hipbone that receives the head of the thighbone.
- any of the suction appendages of a leech, octopus, etc.
- the deep cuplike cavity on the side of the hipbone that receives the head of the thighbone
- a round muscular sucker in flatworms, leeches, and cephalopod molluscs
- the aperture in the thorax of an insect that holds the leg
