of or relating to a substance that suppresses the formation of urine.
any such substance.
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British Dictionary definitions for antidiuretic
(of a hormone, treatment, etc) acting on the kidneys to control water excretion
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