WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / 5 / 5-hydroxytryptamine 5-hydroxytryptamine noun 19 letters Scrabble 41 WWF 40 Definitions noun a neurotransmitter involved in e.g. sleep and depression and memory serotonin Look “5-hydroxytryptamine” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →