18. The computer program product of claim 17 wherein the actions further comprise: from the plurality of morphemes, selecting a leading morpheme that corresponds to a first portion of the identified portmanteau and a trailing morpheme that corresponds to a second portion of the identified portmanteau; and analyzing a combined usage of the leading and trailing morphemes, wherein the derived portmanteau definition is based on the combined usage.
19. The computer program product of claim 18 wherein the actions further comprise: calculating a first string metric between the leading morpheme and the candidate word corresponding to the leading morpheme; calculating a second string metric between the trailing morpheme and the candidate word corresponding to the trailing morpheme; and combining the first and second string metric, wherein the combined usage is based on the combination of the first and second string metric.