1. a large leather suitcase that opens into two hinged compartments 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)

I bumped into this word at the (London) Times Online:

I have heard some people refer to this time of year, perhaps half in jest, as “Chriskwanukkah”, an unlovely portmanteau of Christmas, Chanukkah and Kwanzaa, the African-American winter festival.