Where does “laastarilappu” come from?

laastarilappu (Finnish) comes from Finnish lappu, from Swedish läpp, from Old Swedish lapper, from Finnish lappalainen, from Finnish -läinen, from Finnish laji, from Old Swedish slagh, from Middle Low German slach — to hit.

laastarilappu (Finnish): adhesive patch

Definitions

adhesive patch

Ancestry of “laastarilappu”, step by step

laastarilappu traces back through two separate lines of ancestry.

via Finnish lappu

Step	Language	Word	Meaning
1	Finnish	lappu	A small piece of paper, textile etc; A tag, label
2	Swedish	läpp	lip
3	Old Swedish	lapper	—
4	Finnish	lappalainen	A Sami
5	Finnish	-läinen	Front vowel variant of -lainen
6	Finnish	laji	kind, sort; species; sport
7	Old Swedish	slagh	—
8	Middle Low German	slach	—
9	Old Saxon	slag	—
10	Proto-West Germanic	slagi	blow, strike
11	Swedish	slagg	slag metallurgical waste material
12	Low German	slagge	—
13	Middle Low German	slagge	—
14	Middle Low German	slān	to hit, strike
15	Old Saxon	slāhan	to hit

via Finnish laastari

Step	Language	Word	Meaning
1	Finnish	laastari	adhesive bandage, band-aid US; sticking plaster, plaster UK
2	Old Swedish	plaster	—
3	Latin	emplastrum	plaster, bandage; piece of bark used in budding,...
4	Ancient Greek	ἔμπλαστρον	salve, plaster; a plaster; daub; salve
5	Ancient Greek	ἔμπλαστος	daubed, plastered; daubed on
6	Ancient Greek	ἐμπλάσσω	daub on
7	Ancient Greek	ἐν-	in, within; on
8	Ancient Greek	ἐν	in, on, at; among; in, at, or during the time of
9	Ancient Greek	δέρμα	skin, hide
10	Ancient Greek	γλυφή	carving, carved work; hole cut
11	Ancient Greek	-ῐ́ᾱ	{{l\|en\|-ia}}; "suffix forming abstract feminine...
12	Proto-Indo-European	-íh₂	—
13	Proto-Indo-European	-h₂	Creates collective nouns, which refer to groups...

Every word from Old Saxon slāhan →Every word from Middle Low German slān →Every word from Middle Low German slagge →