5-hydroxyindoleacetic acid
noun
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