- 1鈽（台灣用「鈽」；中國大陸寫「钚」）
Plutonium is a metal you do not meet in a kitchen drawer. It is a chemical element (symbol Pu) that is radioactive: its atoms slowly break apart and give off energy that can harm living things, and that people have learned to use. It is made in nuclear reactors more than it is dug from the ground as a common ore, and it is used in some kinds of nuclear power and in nuclear weapons. That double life — electricity and bombs — is why the word feels grave in the news. It sits in the same naming line as uranium and neptunium: after the far worlds in the sky. Scientists named it after , the body then still called a planet, plus the usual element ending. Handle the idea with care in speech: it is a science and word, not a metaphor for "something strong".
From the word’s history
Named after Pluto + -n- + -ium.
以冥王星 Pluto 命名，加 -n- 和 -ium 構成元素名。
組成Named after Pluto (the dwarf planet) + -n- + -ium, the ending English took for many elements (as in uranium). The planet's name itself goes back to Latin Plūtō and Greek Πλούτων.
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
plutoniumnoun/pluːˈtoʊniəm/
- 1
The transuranic chemical element with atomic number 94 and symbol Pu: a silvery-gray fissile radioactive actinide metal that tarnishes when exposed to air.
- Plutonium? You mean this sucker's nuclear?
- The Samson Option states that Moshe Dayan gave the go-ahead for starting weapon production in early 1968, putting the plutonium separation plant into full operation.
這個拼法也被記錄為下列字的變化形：
- ploutonion
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。