radiactivo
“radiactivo” means “radioactive” in Spanish (describing substances that emit radiation).
radioactive
Also: dangerous
📝 In Action
El uranio es un elemento muy radiactivo.
A2Uranium is a very radioactive element.
Debemos tener cuidado con los residuos radiactivos.
B1We must be careful with radioactive waste.
La zona fue evacuada por una fuga radiactiva.
B2The area was evacuated due to a radioactive leak.
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✏️ Quick Practice
Quick Quiz: radiactivo
Question 1 of 3
How do you say 'radioactive waste' in Spanish?
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👥 Word Family▼
📚 Etymology▼
From the Latin word 'radius' (meaning a ray or spoke of a wheel) combined with 'activus' (meaning active or doing something). It literally means 'actively sending out rays'.
First recorded: Early 20th century (coined after the discovery of radiation).
Cognates (Related words)
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Frequently Asked Questions
Is 'radioactivo' wrong?
No, it isn't wrong and many people use it because it matches the word 'radio'. However, 'radiactivo' is the standard spelling in most textbooks and scientific documents.
Does this word refer to the radio you listen to?
Not directly. While they share a root ('radius'), 'radiactivo' is about physics and energy, while 'la radio' is the device for listening to music.
When should I use 'radiactiva'?
Use it whenever the object you are describing is 'feminine', such as 'la energía radiactiva' or 'una partícula radiactiva'.