# photocatalyst

> English word · Noun

## Definitions
1. A substance that absorbs light and, in doing so, catalyzes a reaction.

## Etymology
From photo- + catalyst.

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