Where does “μονόφθογγος” come from?

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

μονόφθογγος (Ancient Greek): a monophthong

Definitions

μονόφθογγος traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Ancient Greek	μόνος	alone, forsaken, solitary; only; unique
2	Ancient Greek	σπέρμα	seed; semen, sperm; seed-time, sowing
3	Proto-Hellenic	*spérmə	—

Step	Language	Word	Meaning
1	Ancient Greek	φθόγγος	a sound or voice
2	Ancient Greek	φθέγγομαι	I make a sound, utter; I speak loudly, shout, cry...