Portmanteau

[We have public-domain dictionaries available to us; can we please provide one of those definitions without an link to M-W?]

UK: /pO:t'm{nt@u/

US: /pO:rt'm{ntou/

The Merriam-Webster definition of portmanteau gives two meanings:

1. a large suitcase
2. a word or morpheme whose form and meaning are derived from a blending of two or more distinct forms (as smog from smoke and fog)

Of course, wikipedia itself is a portmanteau (of Wiki and encyclopedia).

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External links:

• See Portmanteau Words By Geoff Nunberg for an interesting commentary on this subject.