|
|
tho·ri·um
 thorium
|
|
- pronunciation:
- tho
ri
 m
- features:
- Word Combinations (noun)
| part of speech: |
noun |
| definition: |
a radioactive chemical element of the actinide series that has ninety protons in each nucleus and that occurs as a malleable, lustrous, grayish white solid metal. (symbol: Th)
|
|
|
|
|
|
|