A socket on the sternpost, through which the pintle of the rudder fits, forming a hinge. Scholars differ on its derivation, as it gets confused with gudgeon, the fish. It appears to come from the Middle English gudyon, this from French, goujon, pin or tenon, and could go back to Latin and Greek (but not for stern rudders, as they did not have them). Earlier spellings guidon and gudjin.
#3 in the image
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