Where does “hrdlo” come from?

hrdlo (Old Czech) comes from Proto-Slavic gъrdlo, from Proto-Balto-Slavic gúrʔtlo, from Proto-Indo-European gʷr̥h₃tlóm.

Ancestry of “hrdlo”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	gъrdlo	throat, gorge
2	Proto-Balto-Slavic	gúrʔtlo	—
3	Proto-Indo-European	gʷr̥h₃tlóm	—

hrdlo — Etymology, Origin & Word History | Etymology Explorer