Where does “Monophthongisierung” come from?

Monophthongisierung (German) comes from English monophthong, from Ancient Greek μονόφθογγος, from Ancient Greek μόνος, from Ancient Greek σπέρμα, from Proto-Hellenic *spérmə.

Ancestry of “Monophthongisierung”, step by step

StepLanguageWordMeaning
1EnglishmonophthongA vowel that has the same sound throughout its...
2Ancient Greekμονόφθογγοςa monophthong
3Ancient Greekμόνοςalone, forsaken, solitary; only; unique
4Ancient Greekσπέρμαseed; semen, sperm; seed-time, sowing
5Proto-Hellenic*spérmə
Every word from Proto-Hellenic *spérməEvery word from Ancient Greek σπέρμαEvery word from Ancient Greek μόνος