WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / S / silurian silurian noun 4 syllables 8 letters Scrabble 8 WWF 11 Definitions noun from 425 million to 405 million years ago; first air-breathing animals silurian period Look “silurian” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →