cud
n.— «Major Die Breaks are often referred to as “cuds,” a slang holdover term from the 1960s that stuck. A cud occurs when a section of the die face and corresponding shank breaks away and leaves a void in the die in its place. The die will then strike coins with a raised blob of unstruck metal that has been partially forced up into the void during the strike.» —“Errors Found in Search” by Ken Potter Numismaster.com July 10, 2008. (source: Double-Tongued Dictionary)
Further reading
Asthenosphere, a geologist’s term for the molten layer beneath the earth’s crust, sparks a journey that stretches all the way from ancient Greece to the author of Uncle Tom’s Cabin. Plus: What the heck is a dogberg? It’s when...
Amid court-ordered busing in the 1970s, a middle-school teacher tried to distract her nervous students on the first day of class with this strange assignment: find a monarch caterpillar. The result? A memorable lesson in the miracle of metamorphosis...