 The literary English pronunciation of the goddess is with a long "e".However, Brown and his students use something closer to Latin and Greek, with a short "e" (ignoring the Great Vowel Shift that affects Classical names in English).The Greek and Latin oblique stem of the name is "Erid-", as can be seen in Italian "Eride" and Russian Эрида "Erida", so the adjective in English is "Eridian" .