SEROTONIN /ˌsɛɹəˈtəʊnɪn/ ► audio Scrabble 9 Words With Friends 11 Scrabble letter values: S1E1R1O1T1O1N1I1N1 = 9 Definition noun a neurotransmitter involved in e.g. sleep and depression and memory. — synonyms: 5-hydroxytryptamine Anagrams of SEROTONIN ironstone See all 301 words you can make from SEROTONIN → 9-letter words Words starting with S Words ending with N ← Unscramble different letters