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say it: rah-bi-TUHS-in
robitussin is a noun meaning "trade name of an expectorant that loosens phlegm and makes it easier to cough up". It carries one recorded sense.
trade name of an expectorant that loosens phlegm and makes it easier to cough up
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 robitussin 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.