# photopsin

> English word · Noun

## Definitions
1. Any of a class of photoreceptor proteins present in the cones of the retina.

## Etymology
From photo- + opsin.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/photopsin