5-hydroxyindoleacetic acid
noun
5-hy·droxy·in·dole·ace·tic acid
ˈfīv-hī-ˌdräk-sē-ˌin-(ˌ)dōl-ə-ˌsēt-ik-
: a metabolite C10H9NO3 of serotonin that is present in cerebrospinal fluid and in urine
—abbreviation 5-HIAA
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Merriam-Webster unabridged
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