from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of a group of amines derived from catechol that have important physiological effects as neurotransmitters and hormones and include epinephrine, norepinephrine, and dopamine.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a class of aromatic amines derived from pyrocatechol that are hormones produced by the adrenal gland.
from the GNU version of the Collaborative International Dictionary of English
- n. any of a group of chemicals including epinephrine and norepinephrine that are produced in the medulla of the adrenal gland. They function as nerotransmitters in the sympathetic nervous system. Also, any structurally related chemical substance, whether natural or synthetic.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any of a group of chemicals including epinephrine and norepinephrine that are produced in the medulla of the adrenal gland
Sorry, no etymologies found.