Where does “sisälmysmato” come from?

sisälmysmato (Finnish) comes from Finnish mato, from Proto-Finnic mato, from Proto-Finno-Ugric mačo.

Ancestry of “sisälmysmato”, step by step

sisälmysmato traces back through two separate lines of ancestry.

via Finnish mato

StepLanguageWordMeaning
1Finnishmatoworm; maggot; tilde
2Proto-Finnicmatoworm
3Proto-Finno-Ugricmačo

via Finnish sisälmykset

StepLanguageWordMeaning
1Finnishsisälmyksetviscera; innards, insides, entrails internal organs of the body collectively
2Finnish-mysFront vowel variant of -mus
Every word from Proto-Finno-Ugric mačoEvery word from Proto-Finnic matoEvery word from Finnish mato