The word "gremillion" is spelled with a silent "L", as is common in many French-derived words. The IPA phonetic transcription for this word is /ɡrəˈmɪljən/. The "G" is pronounced with a hard "G" sound, followed by a short "E" sound. The "R" is slightly rolled, and the "M" is pronounced as usual. The "I" is a short "I" sound, followed by the silent "L". The final syllable is pronounced with a short "E" sound, followed by a soft "N".