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A portmanteau is a word that comes from mixing parts of two (or more) other words together.
Portmanteau originally meant a type of suitcase with two separate parts for storage. The first use as a word combination appeared in Lewis Carroll's book Through the Looking-Glass where Humpty Dumpty explains that some of the unusual words in Jabberwocky are combinations of other words packed together into one word, as two parts of a portmanteau suitcase are packed together.