n.

a bony hollow into which a structure fits

receptacle where something (a pipe or probe or end of a bone) is inserted

a receptacle into which an electric device can be inserted

Socketed metallic tube joint of different materials
Design of Socketed Drilled Shafts in Limestone
Model studies of socketed caissons in soft rock
Shaft Resistance of Rock-Socketed Drilled Piers
SOME PROBLEMS IN DESIGN OF ROCK SOCKETED PILE
Skin friction on large-diameter piles socketed into rock
TEST AND RESEARCH ON UNROCK-SOCKETED SUPER-LONG PILE IN DEEP SOFT SOIL
Side Resistance of Large Diameter Bored Piles Socketed into Decomposed Rocks
Analysis and design of drilled shaft foundations socketed into rock: Final report
RESULTS OF TESTS TO DETERMINE SHAFT RESISTANCE OF ROCK-SOCKETED DRILLED PIERS.