Where does “laastitseminen” come from?

laastitseminen (Finnish) comes from Finnish laastita, from Finnish laasti, from Middle Low German plāster, from Latin emplastrum, from Ancient Greek ἔμπλαστρον, from Ancient Greek ἔμπλαστος, from Ancient Greek ἐμπλάσσω, from Ancient Greek ἐν- — Creates collective nouns, which refer to groups...

Ancestry of “laastitseminen”, step by step

Step	Language	Word	Meaning
1	Finnish	laastita	To plaster to apply a plaster on walls etc
2	Finnish	laasti	mortar, plaster
3	Middle Low German	plāster	plaster, gypsum, mortar, cement
4	Latin	emplastrum	plaster, bandage; piece of bark used in budding,...
5	Ancient Greek	ἔμπλαστρον	salve, plaster; a plaster; daub; salve
6	Ancient Greek	ἔμπλαστος	daubed, plastered; daubed on
7	Ancient Greek	ἐμπλάσσω	daub on
8	Ancient Greek	ἐν-	in, within; on
9	Ancient Greek	ἐν	in, on, at; among; in, at, or during the time of
10	Ancient Greek	δέρμα	skin, hide
11	Ancient Greek	γλυφή	carving, carved work; hole cut
12	Ancient Greek	-ῐ́ᾱ	{{l\|en\|-ia}}; "suffix forming abstract feminine...
13	Proto-Indo-European	-íh₂	—
14	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 ἐν- →