dunce hat (English, noun)
expansion: dunce hat (plural dunce hats)
Senses:
glosses: A conical hat that a school pupil is made to wear to indicate that he/she is a dunce.
tags: historical
topics: mathematics
sciences
topology
glosses: 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.
Forms:
form: dunce hats
tags: plural