gudg·eon 2 
(gŭjən)
(gŭjən)n.
1. A metal pivot or journal at the end of a shaft or an axle, around which a wheel or other device turns.
2. The socket of a hinge into which a pin fits.
3. A metal pin that joins two pieces of stone.
4. Nautical The socket for the pintle of a rudder.
[Middle English gudyon, from Old French gojon, peg, diminutive of goi, gouge, from Vulgar Latin *gubius, variant of Late Latin gubia; see GOUGE.]