Where does “снаичка” come from?

снаичка (Macedonian) comes from Macedonian снаа, from Proto-Slavic snъxa, from Proto-Indo-European snusós — daughter-in-law.

Ancestry of “снаичка”, step by step

StepLanguageWordMeaning
1Macedonianснааdaughter-in-law; sister-in-law
2Proto-Slavicsnъxadaughter-in-law
3Proto-Indo-Europeansnusósdaughter-in-law
Every word from Proto-Indo-European snusós →Every word from Proto-Slavic snъxa →Every word from Macedonian снаа →