WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses
Word Usage
"Swedish colleague, the late Nils-Åke Hillarp, he was later able to show that in nerves noradrenaline is synthesized and stored in granules, particles about one ten thousandth of a millimetre in diameter."