Final answer:
The term for extra material or metal in the context of an edge defect is overhang. This is considered a defect because it can affect the product's integrity, appearance, or function and requires extra processing to rectify.
Step-by-step explanation:
In the context of an edge defect, the term for extra material or metal is overhang. An overhang occurs during manufacturing processes, such as molding, casting, or machining, where excess material extends beyond the desired product boundary. It is considered a form of defect because it can adversely affect the structural integrity, aesthetics, or functionality of the final product. Removing these imperfections typically requires additional processing like trimming or grinding to achieve the precise specifications required for the component's application.