Portmanteau (port/man/toe) is a french word that means a suitcase that opens into two parts.

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In Alice through the Looking Glass, Alice has a meeting with Humpty Dumpty. As part of their conversation she asks him if he know what the poem Jabberwocky is about.

He explains that some of the words are Portmanteau words - there are two meanings packed into one word.

Slithy - means lithe and slimy.

Mimsy - flimsy and miserable

Frumious - fuming and furious

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So thanks to Lewis Carroll the definition of a Portmanteau word is 'a word formed by blending the sounds from two or more words and combining their meanings.'