Where does “-plasm” come from?

-plasm (English) comes from Ancient Greek πλάσμα, from Ancient Greek πλάσσω, from Proto-Hellenic pláťťō, from Proto-Hellenic plátʰyō.

Ancestry of “-plasm”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	πλάσμα	something formed, figure, image; counterfeit,...
2	Ancient Greek	πλάσσω	I form, mould, shape, sculpt; I form, train a...
3	Proto-Hellenic	pláťťō	—
4	Proto-Hellenic	plátʰyō	—