- a conical paper hat, formerly placed on the head of a slower child at school
WordReference Random House Unabridged Dictionary of American English © 2026
dunce′ cap′,
- a tall, cone-shaped hat formerly worn by slow or lazy students as a punishment in school.
- 1830–40
Collins Concise English Dictionary © HarperCollins Publishers::
dunce cap, dunce's cap n
'dunce cap' also found in these entries (note: many are not synonyms or translations):