socket

/ˈsɒkɪt//ˈsɑkɪt/

noun

1
An opening into which a plug or other connecting part is designed to fit (e.g. a light bulb socket).
2
A hollow into a bone which a part fits, such as an eye, or another bone, in the case of a joint.
3
One endpoint of a two-way communication link, used for interprocess communication across a network.
4
One endpoint of a two-way named pipe on Unix and Unix-like systems, used for interprocess communication.
5
A hollow tool for grasping and lifting tools dropped in a well-boring.
6
The hollow of a candlestick.
7
A steel apparatus attached to a saddle to protect the thighs and legs.

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