Where does “piirakkadiagrammi” come from?

piirakkadiagrammi (Finnish) comes from Finnish diagrammi, from Italian diagramma, from Ancient Greek διάγραμμα, from Ancient Greek δῐᾰ-, from Ancient Greek διά, from Proto-Indo-European dwís, from Proto-Indo-European dwóh₁ — two.

Ancestry of “piirakkadiagrammi”, step by step

piirakkadiagrammi traces back through two separate lines of ancestry.

via Finnish diagrammi

StepLanguageWordMeaning
1Finnishdiagrammidiagram
2Italiandiagrammadiagram; chart; graph
3Ancient GreekδιάγραμμαThat which is marked out in lines, plan, diagram
4Ancient Greekδῐᾰ-apart; through, across; through; in different...
5Ancient Greekδιάthroughout
6Proto-Indo-Europeandwístwice, doubly; in two
7Proto-Indo-Europeandwóh₁two

via Finnish piirakka

StepLanguageWordMeaning
1Finnishpiirakkapie; pierogi, pirog; pasty
2Russianпиро́гpie
3Old East Slavicпирогъ
4Proto-Slavicpirogъtype of pie?
5Proto-Slavicpirъfest; party
Every word from Proto-Indo-European dwóh₁Every word from Ancient Greek δῐᾰ-Every word from Proto-Indo-European dwís