Definition

The ability of a material to change its color or transparency when exposed to light, especially sunlight, and then return to its original state when the light is removed.

Example

Photochromism allows sunglasses to darken in bright sunlight and become clear indoors.

Conversation

Have you heard about the concept of photochromism?

Yeah, it's when materials change color in response to light, right?

Exactly! It’s really fascinating how some glasses darken in sunlight due to photochromism.

I know! It’s such a clever feature for protecting your eyes.

Synonyms & Antonyms

Root Explanation

Photochromism → It is formed from "photo-" (from Greek "phōs", meaning light) and "chromism" (from Greek "chroma", meaning color). The word describes the phenomenon where a material changes color in response to light exposure.

Memory Tip

Think of 'light' ('photo-') causing a change in 'color' ('chromism') — that's what photochromism means.

Visually Confused Words