say it: MAHRSH-mel-oh
marshmallow is a noun meaning "spongy confection made of gelatin and sugar and corn syrup and dusted with powdered sugar". It carries one recorded sense.
spongy confection made of gelatin and sugar and corn syrup and dusted with powdered sugar
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 marshmallow 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.