1: a large suitcase that opens into two parts
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)
She carried an old portmanteau with her possessions.
And here's a portmanteau word: evapotranspiration, see here: http://1word1day.livejournal.com/404330.html?thread=1177706
Middle French portemanteau, from porter to carry + manteau mantle, from Latin mantellum
First Known Use: 1579