WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / S / silurian period silurian period noun 15 letters Scrabble 17 WWF 21 Definitions noun from 425 million to 405 million years ago; first air-breathing animals silurian Look “silurian period” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →