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a combining form used in the names of chemical compounds which are the normal or parent forms of the compound denoted by the base words:
Origin of nor-
short for normal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for nor-


combining form
indicating that a chemical compound is derived from a specified compound by removal of a group or groups: noradrenaline
indicating that a chemical compound is a normal isomer of a specified compound
Word Origin
by shortening from normal
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
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nor- in Medicine

nor- pref.
A precursor compound that differs from its successor by the absence of a radical group, usually methyl: norepinephrine.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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