Where does “cherological” come from?

cherological (English) comes from English cherology, from Ancient Greek χείρ, from Ancient Greek πτερόν, from Proto-Indo-European péth₂r̥, from Proto-Indo-European peth₂- — to spread out; to fly.

cherological (English): Relating to cherology

Definitions

Relating to cherology

Ancestry of “cherological”, step by step

Step	Language	Word	Meaning
1	English	cherology	The equivalent of phonology for sign languages
2	Ancient Greek	χείρ	hand
3	Ancient Greek	πτερόν	feather; wing; Any winged creature
4	Proto-Indo-European	péth₂r̥	wing; feather
5	Proto-Indo-European	peth₂-	to spread out; to fly

Every word from Proto-Indo-European peth₂- →Every word from Proto-Indo-European péth₂r̥ →Every word from Ancient Greek πτερόν →