plutonium

noun

Etymology: After Pluto (dwarf planet) + -n- + -ium. More in Wikipedia at plutonium § History.

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.”

2. Alternative form of ploutonion.