Also found in: Medical, Financial, Encyclopedia, Wikipedia.
An unaltered parent compound: norepinephrine.
[Short for normal.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Chemistry) indicating that a chemical compound is derived from a specified compound by removal of a group or groups: noradrenaline.
2. (Chemistry) indicating that a chemical compound is a normal isomer of a specified compound
[by shortening from normal]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
nor(nɔr; unstressed nər)
1. (used in negative phrases, esp. after neither, to introduce the second member in a series, or any subsequent member): Neither he nor I will be there. They won't wait for you, nor for me, nor for anybody.
2. (used to continue the force of a negative, as not, no, never, etc., occurring in a preceding clause): I never saw him again, nor did I regret it.
3. (used after an affirmative clause, or as a continuative, in the sense of and not): They are happy, nor need we worry.
4. Older Use. than.
5. Archaic. (used without a preceding neither, the negative force of which is understood): He nor I was there.
6. Archaic. (used instead of neither as correlative to a following nor): Nor he nor I was there.
[1300–50; Middle English, contraction of nother, Old English nōther=ne not + ōther (contraction of ōhwæther) either; compare or1]
usage: See neither.
a Boolean operator that returns a positive result when both operands are negative.
a combining form used in the names of chemical compounds that are the normal or parent forms of the compound denoted by the base words: l-norepinephrine.
[short for normal]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.