Where does “placoderm” come from?

placoderm (English) comes from English -derm, from Ancient Greek δέρμα, from Ancient Greek γλυφή, from Ancient Greek -ῐ́ᾱ, from Proto-Indo-European -íh₂, from Proto-Indo-European -h₂ — Creates collective nouns, which refer to groups...

placoderm (English): A member of an extinct class of jawed fish with...

Definitions

A member of an extinct class of jawed fish with...

Ancestry of “placoderm”, step by step

Step	Language	Word	Meaning
1	English	-derm	skin or covering
2	Ancient Greek	δέρμα	skin, hide
3	Ancient Greek	γλυφή	carving, carved work; hole cut
4	Ancient Greek	-ῐ́ᾱ	{{l\|en\|-ia}}; "suffix forming abstract feminine...
5	Proto-Indo-European	-íh₂	—
6	Proto-Indo-European	-h₂	Creates collective nouns, which refer to groups...

Every word from Proto-Indo-European -h₂ →Every word from Ancient Greek -ῐ́ᾱ →Every word from Ancient Greek γλυφή →