WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / A / atomic number 90 atomic number 90 noun 16 letters Scrabble 20 WWF 26 Definitions noun a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands ththorium Look “atomic number 90” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →