dunce hat
dunce hat · dunce hats
A conical hat that a school pupil is made to wear to indicate that he/she is a dunceA conical hat that a school pupil is made to wear to indicate that he/she is a dunce.
Meaning
2 senses(historical)A conical hat that a school pupil is made to wear to indicate that he/she is a dunce.
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.