doughnut
n.— «According to court documents, some of the iodine was smuggled over the border and driven to Escondido inside car tires that were referred to as “doughnuts” by members of the organization.» —“Five from Escondido among those named” by J. Harry Jones San Diego Union-Tribune (California) Nov. 14, 2004. (source: Double-Tongued Dictionary)
Further reading
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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...