WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / T / thorium-228 thorium-228 noun 11 letters Scrabble 12 WWF 13 Definitions noun radioactive isotope of thorium with mass number 228 radiothorium Look “thorium-228” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →