Portmanteau

A word that blends the sounds and meanings of two or more different words.

Originally, a portmanteau was a kind of suitcase. The modern meaning was coined by Lewis Carroll in Through the Looking-Glass, and What Alice Found There, in the scene in which Humpty Dumpty, explaining the new words in the first verse of the poem "Jabberwocky" to Alice, says, "Well, slithy means lithe and slimy... You see it's like a portmanteau - there are two meanings packed up into one word."

The title of this lexicon, Hyperlexicon, is a portmanteau word, as is the word Jackalope.