American Heritage® Dictionary of the English Language, Fourth Edition
- n. A cone-shaped paper cap, formerly placed on the head of a slow or lazy pupil. Also called fool's cap.
- n. A conical hat one pupil is forced to wear to indicate he is a dunce.
- n. The topological space obtained by identifying the sides comprising the boundary of a triangle, two sides with consistent orientation and the third with the reverse orientation.
- n. a cone-shaped paper hat formerly placed on the head of slow or lazy pupils
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