Where does “rintaontelo” come from?

rintaontelo (Finnish) comes from Finnish ontelo, from Finnish -lö, from Finnish -lä, from Finnish -as, from Proto-Finnic -s, from Proto-Finno-Ugric -s.

rintaontelo (Finnish): thoracic cavity, chest cavity

Definitions

thoracic cavity, chest cavity

Ancestry of “rintaontelo”, step by step

rintaontelo traces back through two separate lines of ancestry.

via Finnish ontelo

Step	Language	Word	Meaning
1	Finnish	ontelo	cavity; sinus; coelenteron
2	Finnish	-lö	Front vowel variant of -lo
3	Finnish	-lä	Front vowel variant of -la
4	Finnish	-as	Forms some adjectives; Forms some nouns
5	Proto-Finnic	-s	Forms nouns
6	Proto-Finno-Ugric	-s	—

via Finnish rinta

Step	Language	Word	Meaning
1	Finnish	rinta	breast; chest, especially the front side of it
2	Finnish	-mä	Front vowel variant of -ma

Every word from Proto-Finno-Ugric -s →Every word from Finnish -lä →Every word from Finnish -lö →