Learn how to say Delphinus correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word Delphinus:
a small constellation (the Dolphin), just north of the celestial equator near Cygnus.
(as genitive Delphini /dɛlˈfʌɪni/) used with preceding letter or numeral to designate a star in this constellation:
the star Alpha Delphini