1. (Science: zoology) a small European freshwater fish (Gobio fluviatilis), allied to the carp. It is easily caught and often used for food and for bait. In America the killifishes or minnows are often called gudgeons.
3. A person easily duped or cheated.
4. (Science: machinery) The pin of iron fastened in the end of a wooden shaft or axle, on which it turns; formerly, any journal, or pivot, or bearing, as the pintle and eye of a hinge, but especially. The end journal of a horizontal.