dunce hat
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English[edit]
Noun[edit]
dunce hat (plural dunce hats)
- (historical) A conical hat that a school pupil is made to wear to indicate that he/she is a dunce.
- (topology) 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.
Synonyms[edit]
- (both senses): dunce cap