Where does “pteropsin” come from?

pteropsin (English) comes from English opsin, from English rhodopsin, from Ancient Greek ὄψις, from Ancient Greek ὄψ, from Proto-Hellenic wókʷs, from Proto-Indo-European wekʷ- — to speak, to sound out.

pteropsin (English): A non-visual opsin present in some winged insects

Definitions

A non-visual opsin present in some winged insects

Ancestry of “pteropsin”, step by step

Step	Language	Word	Meaning
1	English	opsin	Any of a group of light-sensitive proteins in the...
2	English	rhodopsin	A light-sensitive pigment in the rod cells of the...
3	Ancient Greek	ὄψις	view
4	Ancient Greek	ὄψ	voice; word; eye, face
5	Proto-Hellenic	wókʷs	voice
6	Proto-Indo-European	wekʷ-	to speak, to sound out

Every word from Proto-Indo-European wekʷ- →Every word from Proto-Hellenic wókʷs →Every word from Ancient Greek ὄψ →