a character in a nursery rhyme (=an old song or poem for young children) and in the book Through the Looking-Glass by Lewis Carroll, who is like a large egg in shape. The rhyme goes: Humpty Dumpty sat on a wall,/Humpty Dumpty had a great fall./All the King's horses and all the King's men/Couldn't put Humpty together again.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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