mastsocket
nounUK /ˈmɑːstˌsɒkɪt/
US /ˈmæstˌsɑːkɪt/
A mastsocket is a strong cup that holds the bottom of a tall pole on a boat.
The sailor checked the mastsocket to make sure the mast stood straight.
OTHER MEANINGS
2. A fitting on a vehicle or structure that supports a pole or antenna.
The radio antenna was fixed into a mastsocket on the roof.
3. A hollow part that a pole fits into so it can stand upright.
He lowered the flagpole into the mastsocket in the ground.
4. A socket-like joint that keeps a tall post steady.
The tent's center pole rested in a mastsocket to stay firm.