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