Definition

A rare and radioactive metal that glows in the dark and is found in small amounts in certain minerals. It is used in medical treatments and in some types of paints that shine.

Example

Radium was once commonly used in cancer treatment before safer alternatives were discovered.

Conversation

Did you know that radium was once used in glow-in-the-dark watches?

Really? I had no idea it was used for that!

Yeah, it's fascinating how something so radioactive could be used in everyday items.

Totally! I wonder if those watches are still safe to wear.

Synonyms & Antonyms

Root Explanation

Radium is derived from the Latin word "radius" (meaning ray or beam) combined with the suffix "-ium" (used in chemistry to denote metallic elements). The name radium reflects its property of emitting rays, particularly in the form of radiation.

Memory Tip

Think of 'radius' as a ray or beam of light, which helps you remember that radium is known for emitting rays.

Visually Confused Words