chef-d'oeuvre
noun [ C ] formal uk/ˌʃeɪdˈɜː.vrə/ us/ˌʃeɪdˈɝː.vrə/ chefs-d'oeuvre uk/ˌʃeɪdˈɜː.vrə/ us/-ˈɝː-/
（艺术家、作家的）杰作，代表作
an artist or writer's greatest piece of work
The Decameron is widely regarded as Boccaccio's chef-d'oeuvre. 《十日谈》被公认为薄伽丘的杰作。
Compare: masterpiece