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单词
radioactinium
释义
WordReference Random House Unabridged Dictionary of American English © 2024
ra•di•o•ac•tin•i•um
(rā′dē ō ak tin
′
ē əm),
USA pronunciation
n.
[
Chem.
]
Chemistry
the radioactive isotope of thorium having a mass number 227 and a half-life of 18.8 days.
Symbol:
RdAc, Th 227
radio
- +
actinium
1905–10
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combust
combustibility
combustible
combustibleness
combustibly
combustion
combustion chamber
combustion engine
combustion tube
combustive
combustor
comd
comdg.
comdg
comdr.
comdr
comdt.
comdt
come
come about
come across
come-all-ye
come at
comeback
come between
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更新时间:2025/7/2 23:49:50