Source : WordNet®

portmanteau word
     n : a new word formed by joining two others and combining their
         meanings; "`smog' is a blend of `smoke' and `fog'";
         "`motel' is a portmanteau word made by combining `motor'
         and `hotel'"; "`brunch' is a well-known portmanteau"
         [syn: {blend}, {portmanteau}]