Definition

Relating to or caused by the emission of radiation, often from unstable atomic nuclei.

Example

The radioactive material must be handled with care to avoid exposure.

Conversation

Did you hear about that radioactive waste found near the river?

Yeah, it's pretty concerning how close it is to our town.

I wonder how long it's been radioactive and what the effects could be.

Hopefully, they take action quickly to keep everyone safe.

Synonyms & Antonyms

Root Explanation

Radioactive → It is formed from "radio" (from Latin *radius*, meaning ray) and "active" (from Latin *activus*, meaning having the power to act). The word "radioactive" describes materials that emit rays or particles as a result of nuclear decay, indicating their active nature in releasing energy.

Memory Tip

Think of 'rays' ('radio') being 'active' — that's why radioactive materials are those that emit rays or particles.

Visually Confused Words