Where does “nozdra” come from?

nozdra (Slovak) comes from Proto-Slavic nozdra, from Proto-Slavic nȍzdrь, from Proto-Slavic nȍsъ, from Proto-Balto-Slavic nasús, from Proto-Indo-European néh₂s- — nose, nostril.

nozdra (Slovak): nostril

Definitions

nostril

Ancestry of “nozdra”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	nozdra	nostril
2	Proto-Slavic	nȍzdrь	—
3	Proto-Slavic	nȍsъ	nose
4	Proto-Balto-Slavic	nasús	nose
5	Proto-Indo-European	néh₂s-	nose, nostril

Every word from Proto-Indo-European néh₂s- →Every word from Proto-Balto-Slavic nasús →Every word from Proto-Slavic nȍsъ →