WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / M / melatonin melatonin noun /mɛlətoʊnɪn/ 4 syllables 9 letters Scrabble 11 WWF 15 Definitions noun hormone secreted by the pineal gland Look “melatonin” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →