Definition from Wiktionary, the free dictionary
- The past participle currently has two different pronunciations: one corresponding to gespien and the other to gespieen. Today, though, the only official spelling is gespien, regardless of pronunciation.
- Similary the conjunctive (subjunctive) is spelled spiee or spie. Both are pronounced [ˈʃpiːə], but only the latter spelling is official nowadays.
- speien in Duden online