p 3 l 1 u 1 t 1 o 1 n 1 i 1 u 1 m 3
9 letters · 13 points in Scrabble
Meaning
noun a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 1
originAfter Pluto (dwarf planet) + -n- + -ium. More in Wikipedia at plutonium § History.
Etymology from Wiktionary, CC BY-SA 3.0