say it: PAWRT-mahn-toh
portmanteau is a noun meaning "a new word formed by joining two others and combining their meanings". It carries 2 recorded senses.
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”
a large travelling bag made of stiff leather
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for portmanteau come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.