dunce hat

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English[edit]

A child wearing a dunce hat

Noun[edit]

dunce hat (plural dunce hats)

  1. (historical) A conical hat that a school pupil is made to wear to indicate that he/she is a dunce.
  2. (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.

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