# melanopsin

> English word · Noun

## Definitions
1. A type of photopigment (an opsin) found in the retina; it is involved in the regulation of circadian rhythms

## Etymology
From melano- + opsin.

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