WordNet Dictionary
Webster's 1913 Dictionary\Ac*tin"i*um\, n. [Gr. ?, ?, ray.] (Chem.) A supposed metal, said by Phipson to be contained in commercial zinc; -- so called because certain of its compounds are darkened by exposure to light.
| Pronunciation: | ak'tineeum | ||
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| WordNet Dictionary | |||
| Definition: | [n] a radioactive element of the actinide series; found in uranium ores | ||
| Synonyms: | Ac, atomic number 89 | ||
| See Also: | chemical element, element, uranium ore | ||
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| Webster's 1913 Dictionary | |||
| Definition: | \Ac*tin"i*um\, n. [Gr. ?, ?, ray.] (Chem.) A supposed metal, said by Phipson to be contained in commercial zinc; -- so called because certain of its compounds are darkened by exposure to light. | ||
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