An opening in any fitting that matches the outside diameter of a pipe or tube, wtih a further recessed through opening matching the inside diameter of the same pipe or tube
In biology:
Eye socket, a region in the skull where the eyes are positioned
Tooth socket, a cavity containing a tooth, in those bones that bear teeth
Dry socket, a painful opening as a result of the blood not clotting after a tooth is pulled
Socket (film), a gay-themed science-fiction indie film
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