We found 2 dictionaries that define the word radioactive materials:

General (2 matching dictionaries)

1. radioactive materials: Vocabulary.com
2. Radioactive materials: Wikipedia, the Free Encyclopedia

(Note: See radioactive_material as well.)

Definitions from WordNet (radioactive material) ▸ noun:  material that is radioactive ▸ Also see radioactive_material Phrases: radioactive materials licensing, more... ▸ Words similar to radioactive materials ▸ Usage examples for radioactive materials ▸ Idioms related to radioactive materials ▸ Wikipedia articles (New!) ▸ Words that often appear near radioactive materials ▸ Rhymes of radioactive materials ▸ Invented words related to radioactive materials