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- perches 30
- internationale 10
- crazy quilt 42
- incompetence 16
protactinium
noun
prot·ac·tin·i·um ˌprō-ˌtak-ˈti-nē-əm 
: a shiny radioactive metallic element of relatively short life see Chemical Elements Table
Example Sentences
Recent Examples on the Web These natural uranium isotopes decay into the element thorium, which in turn decays into protactinium, and each has its own isotopes. 
Artemis Spyrou, The Conversation, 24 May 2022
Artemis Spyrou, The Conversation, 24 May 2022 Word History
Etymology
New Latin
First Known Use
1918, in the meaning defined above
Time Traveler
The first known use of protactinium was in 1918 👨🏻🏫 Mr. Ng 韋氏詞典 📚 – mw.mister5️⃣.net
切換為繁體中文