hydroxytryptamine

noun
hy·​droxy·​tryp·​ta·​mine | \hī-ˌdräk-sē-ˈtrip-tə-ˌmēn \

Definition of hydroxytryptamine 

: serotonin usually preceded by the numeral 5 5-hydroxytryptamine

First Known Use of hydroxytryptamine

1949, in the meaning defined above

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The first known use of hydroxytryptamine was in 1949

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