papaverine Papaverales • papaverous · · · Info · Definitions · Synonyms · Characters · · papaverine · · Text Latin · · Script 10 · · Length Definitions · · · (noun) an alkaloid medicine (trade name Kavrin) obtained from opium; used to relax smooth muscles; it is nonaddictive. Synonyms: Kavrin. · · Noun Definition 1 Synonyms · · · kavrin · · Synonym 1 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E p latin small letter p U+0070 r latin small letter r U+0072 v latin small letter v U+0076