adjective

radioactive

radioactive

Radioactive waste must be stored safely.

Radioactive waste must be stored safely.

The area was contaminated with radioactive material.

The area was contaminated with radioactive material.

((radioactive)) ((noun)) emitting radiation The area was contaminated with radioactive material.

Synonyms: radiant, emitting radiation; Antonyms: stable, non-radioactive

From Latin 'radius' (ray) and 'activus' (active). Meaning 'active with rays'.

Imagine a 'radio' being 'active' and sending out invisible, powerful signals (rays).

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