Where does “tenouninký” come from?

tenouninký (Czech) comes from Czech tenký, from Old Czech tenký, from Proto-Slavic tьnъkъ, from Proto-Indo-European ténh₂us, from Proto-Indo-European tenh₂-, from Proto-Indo-European ten- — to stretch, to extend.

tenouninký (Czech): of 2nd degree

Definitions

of 2nd degree

Ancestry of “tenouninký”, step by step

Step	Language	Word	Meaning
1	Czech	tenký	thin
2	Old Czech	tenký	thin
3	Proto-Slavic	tьnъkъ	thin
4	Proto-Indo-European	ténh₂us	thin
5	Proto-Indo-European	tenh₂-	to stretch, to extend
6	Proto-Indo-European	ten-	to stretch, to extend

Every word from Proto-Indo-European ten- →Every word from Proto-Indo-European tenh₂- →Every word from Proto-Indo-European ténh₂us →