Medical Definition of 5-hydroxyindoleacetic acid
: a metabolite C10H9NO3 of serotonin that is present in cerebrospinal fluid and in urine —abbreviation 5-HIAA
Love words? Need even more definitions?Merriam-Webster unabridged
Words at Play
Ask the Editors
Brand Name Vocabulary Quiz
You’re gonna need some moxie to ace this quiz
Commonly Confused Words Quiz
Take a (break/brake) and (pore/pour) over this (c...
How Strong Is Your Vocabulary?
Test your vocabulary with our 10-question quiz!
Spelling Bee Quiz
Can you outdo past winners of the National Spelli...