8 letters · 8 points in Scrabble
noun from 425 million to 405 million years ago; first air-breathing animals
originEtymology tree Latin Silurēs Proto-Indo-European *-nós Proto-Italic *-nos Latin -nus Latin -ānus Latin -iānusbor. English -ian English Silurian From Latin Silurēs + English -ian.
Etymology from Wiktionary, CC BY-SA 3.0