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From The Collaborative International Dictionary of English v.0.48:
norepinephrine \norepinephrine\ n. A hormone (C8H11NO3) secreted by the adrenal medulla; it also serves as a neurotransmitter, released at synapses; called also noradrenaline. Chemically it is 2-amino-1-(3,4-dihydroxyphenyl)ethanol. It is a precursor of epinephrine in the body. Syn: noradrenaline. [WordNet 1.5] norethandrolone