| NOUN | substance | actinium, Ac, atomic number 89 | a radioactive element of the actinide series |
|---|
| Meaning | A radioactive element of the actinide series; found in uranium ores. | |
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| Synonyms | Ac, atomic number 89 | |
| Broader | chemical element, element | Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter |
| Substance of | uranium ore | Any ore from which uranium can be extracted |
| Spanish | actinio, número atómico 89 | |
| Catalan | Ac, actini, número atòmic 89 | |
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