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Related to nor-: NOR flash, NOR gate


An unaltered parent compound: norepinephrine.

[Short for normal.]


combining form
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]


(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]


1. North.
2. Northern.
3. Norway.


1. north.
2. northern.