Where does “retussiruisku” come from?

retussiruisku (Finnish) comes from Finnish ruisku, from Finnish -u, from Proto-Finnic -u — Forms nouns from adjectives, nouns.

Ancestry of “retussiruisku”, step by step

retussiruisku traces back through two separate lines of ancestry.

via Finnish ruisku

StepLanguageWordMeaning
1Finnishruiskusprayer, squirt, douche; syringe
2Finnish-uForms nouns from verbs. Most common with "e"- and...
3Proto-Finnic-uForms nouns from adjectives, nouns

via Finnish retussi

StepLanguageWordMeaning
1Finnishretussiretouch, retouching
Every word from Proto-Finnic -u →Every word from Finnish -u →Every word from Finnish ruisku →