WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / S / serotonin serotonin noun 9 letters Scrabble 9 WWF 11 Definitions noun a neurotransmitter involved in e.g. sleep and depression and memory 5-hydroxytryptamine Look “serotonin” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →