Where does “spermatagonium” come from?

spermatagonium (English) comes from English -gonium, from Ancient Greek γονή, from Ancient Greek -ή, from Ancient Greek -ᾱ, from Proto-Indo-European -éh₂.

Ancestry of “spermatagonium”, step by step

Step	Language	Word	Meaning
1	English	-gonium	A reproductive structure of some organisms
2	Ancient Greek	γονή	offspring; that which engenders, seed; act of...
3	Ancient Greek	-ή	suffix of feminine nouns in the [[Appendix:Ancient Greek first declension
4	Ancient Greek	-ᾱ	nominal suffix
5	Proto-Indo-European	-éh₂	—

Every word from Proto-Indo-European -éh₂ →Every word from Ancient Greek -ή →Every word from Ancient Greek -ᾱ →