Meaning & Definition of word "Radioactive"

to

arrow

    Radioactive

    /ˌreɪdi.oʊˈæk.tɪv/

    adjective:

    • 1. Emitting or relating to the emission of ionizing radiation or particles.
      • Example: Uranium is a radioactive element used in nuclear fuel.
    • 2. Capable of undergoing radioactive decay, leading to the emission of radiation.
      • Example: Radon is a naturally occurring radioactive gas found in basements.
    • 3. Describes materials or substances that emit radiation as a result of nuclear reactions.
      • Example: The radioactive waste must be stored securely to prevent contamination.

    Etymology

    From the combination of 'radio-' meaning ray, and 'active' meaning capable of action.

    Common Phrases and Expressions

    radioactive waste:

    Waste that contains radioactive material and poses a potential threat to the environment.

    radioactive decay:

    The process by which an unstable atomic nucleus loses energy by radiation.

    radioactive isotope:

    An isotope that is unstable and emits radiation.

    Related Words

    radiation:

    The emission of energy as electromagnetic waves or as moving subatomic particles.

    nuclear:

    Relating to the nucleus of an atom, often involving energy release.

    Slang Meanings of radioactive

    Meaning: Glow-in-the-dark

    Example Sentence: That watch is so radioactive, it practically glows in the dark!

    Meaning: Intensely exciting or dangerous

    Example Sentence: That party was radioactive; it was wild!