Where does “cherology” come from?

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

cherology (English): The equivalent of phonology for sign languages

Definitions

The equivalent of phonology for sign languages

Ancestry of “cherology”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	χείρ	hand
2	Ancient Greek	πτερόν	feather; wing; Any winged creature
3	Proto-Indo-European	péth₂r̥	wing; feather
4	Proto-Indo-European	peth₂-	to spread out; to fly

Words derived from “cherology”

cherological

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