Etymology
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serotonin (n.)

neurotransmitting chemical, 1948, coined from sero-, combining form of serum (q.v.) + ton(ic) + chemical suffix -in (2).

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Definitions of serotonin

serotonin (n.)
a neurotransmitter involved in e.g. sleep and depression and memory;
Synonyms: "-hydroxytryptamine
From wordnet.princeton.edu