Answer | Crossword Clue |
---|---|
promethiums | PROMETHIUM, a radioactive rare-earth element also PROMETHEUM |
promethium | a radioactive rare-earth element also PROMETHEUM |
prometheums | PROMETHEUM, the former name of promethium, a radioactive element also PROMETHIUM |
prometheum | the former name of promethium, a radioactive element also PROMETHIUM |