noun
Madama Butterfly; Madam Butterfly
Refers specifically to Giacomo Puccini's opera. The title is a proper noun and is not used generically.
蝶々夫人はプッチーニの有名なオペラです。
Madama Butterfly is a famous opera by Puccini.
来月、蝶々夫人を観に行く予定です。
I plan to go see Madama Butterfly next month.
The Japanese title is a direct translation of the Italian 'Madama Butterfly', using 蝶々 (butterfly) and 夫人 (madam/lady).