'catecholamine' definitions:

Definition of 'catecholamine'

(from WordNet)
noun
Any of a group of chemicals including epinephrine and norepinephrine that are produced in the medulla of the adrenal gland

Definition of 'catecholamine'

From: GCIDE
  • catecholamine \catecholamine\ n. [catechol + amine.] 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. [WordNet 1.5 +PJC]