Answer:
Oeuvre d'art is a French equivalent of 'work of art'. The feminine noun 'oeuvre' means 'work'. The preposition 'de'* means 'of'. The masculine noun 'art' means 'art'. All together, they're pronounced 'uh-vruh dahr'.
*The vowel 'e' of 'de' drops before a noun that begins with a vowel. The temporary nature of the drop is indicated by an apostrophe: 'd'art'.