[hahy-puh-zan-theen, -thin]
  1. a white, crystalline, almost water-soluble, alkaloidal purine derivative, C5H4N4O, found in animal and vegetable tissues: used chiefly in biochemical research.

Origin of hypoxanthine

First recorded in 1835–45; hypo- + xanthine
Related formshy·po·xan·thic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for hypoxanthine


  1. a white or colourless crystalline compound that is a breakdown product of nucleoproteins. Formula: C 5 H 4 N 4 O
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

hypoxanthine in Medicine


  1. A purine present in muscle and other tissues, formed during uric acid synthesis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.