proprietary drug proprietary colony • proprietor · · · Info · Definitions · Synonyms · Characters · · proprietary drug · · Text Common · · Latin · · Scripts 16 · · Length 5 · · Syllables Definitions · · · (noun) a drug that has a trade name and is protected by a patent (can be produced and sold only by the company holding the patent). Synonyms: brand-name drug, proprietary drug. · · Noun Definition 1 Synonyms · · · brand-name drug · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075 y latin small letter y U+0079