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Definition of Dunce cap
1. Noun. A cone-shaped paper hat formerly placed on the head of slow or lazy pupils.
Definition of Dunce cap
1. Noun. A conical hat one pupil is forced to wear to indicate he is a dunce. ¹
2. Noun. 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. ¹
¹ Source: wiktionary.com