robitussin robin's plantain • roble · · · Info · Definitions · Characters · · robitussin · · Text Latin · · Script 10 · · Length 4 · · Syllables Definitions · · · (noun) trade name of an expectorant that loosens phlegm and makes it easier to cough up. Synonyms: Robitussin. · · Noun Definition 1 Characters · · b latin small letter b U+0062 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075