Definition of nor- in English:

nor-

prefix

Chemistry
Denoting an organic compound derived from another, in particular by the shortening of a chain or ring by the removal of one methylene group or by the replacement of one or more methyl side chains by hydrogen atoms: noradrenaline

Origin

from nor(mal), originally used to refer to a compound without methyl substituents.

Definition of nor- in:

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Word of the day anomalous
Pronunciation: əˈnämələs
adjective
deviating from what is standard, normal, or expected