Definition

Not allowing light to pass through; designed to block light.

Example

The photographer used a lightproof bag to protect the film from exposure.

Conversation

Did you get the new camera I told you about?

Yeah, I did! It came with a lightproof case, which is great.

That's awesome! I always worry about exposing my film to light.

Exactly, the lightproof design makes it so much easier to store.

Synonyms & Antonyms

Root Explanation

Lightproof → It is formed from "light" (from Old English *leoht*, meaning illumination or brightness) and "proof" (from Old English *prōf*, meaning to test or to prove). The word "lightproof" means capable of preventing light from passing through or being tested by light.

Memory Tip

Think of something that is designed to block or prevent 'light' — that's why 'lightproof' means it keeps light out.

Visually Confused Words