WORD MEANING
Plutonium meaning
plu-TOH-nee-um · noun
A radioactive chemical element with the symbol Pu and atomic number 94, used as fuel in nuclear reactors and in nuclear weapons.
See all 16 words from the September 7, 2026 puzzle →Other meanings
A fictional or metaphorical substance representing extreme power or danger.
A code name or nickname in certain contexts, such as software or projects.
Plutonium is primarily known as a radioactive element but can also appear as a name or term in various specialized or informal contexts.
Examples
The reactor uses plutonium as a fuel source.
Plutonium is highly radioactive and requires careful handling.