The word "grinstein" is spelled with the IPA phonetic transcription /ˈɡraɪn.staɪn/. This word is a surname and its spelling is based on the German language. The "gr" is pronounced as the consonant cluster "gr" and the "ei" is pronounced as the diphthong "ai". The "stei" part of the word is pronounced as a single syllable, with the "ei" being pronounced as "i", and the final "n" is pronounced as a nasal consonant.