Where does “želvovinový” come from?

želvovinový (Czech) comes from Czech želvovina, from Czech želva, from Old Czech zelva, from Proto-Slavic zъly, from Proto-Balto-Slavic *źulūˀ, from Proto-Indo-European *ǵl̥h₂ōws — sister-in-law (husband's sister).

želvovinový (Czech): tortoiseshell

Definitions

tortoiseshell

Ancestry of “želvovinový”, step by step

Step	Language	Word	Meaning
1	Czech	želvovina	tortoiseshell
2	Czech	želva	turtle, tortoise, terrapin; old woman
3	Old Czech	zelva	—
4	Proto-Slavic	zъly	sister-in-law
5	Proto-Balto-Slavic	*źulūˀ	—
6	Proto-Indo-European	*ǵl̥h₂ōws	sister-in-law (husband's sister)

Every word from Proto-Indo-European *ǵl̥h₂ōws →Every word from Proto-Balto-Slavic *źulūˀ →Every word from Proto-Slavic zъly →