| / English Dictionary |
ACTINIUM
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
A radioactive element of the actinide series; found in uranium ores
Synonyms:
Ac; actinium; atomic number 89
Classified under:
Hypernyms ("actinium" is a kind of...):
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)
Holonyms ("actinium" is a substance of...):
uranium ore (any ore from which uranium can be extracted)
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