radioactive

radioactive

CEFR: C1-C2 /ra-dioac-tive/ [r.ey2.d.iy0.ow0.ae1.k.t.ih0.v]

Something that is radioactive contains a substance that produces energy in the form of powerful and harmful rays. Here are example sentences:

Example Sentences:
The government has been storing radioactive waste at Fernald for 50 years.
The nucleus of a radioactive atom disintegrates spontaneously and forms an atom of a different element while emitting radiation in the process.