The Collaborative International Dictionary of English v.0.48:

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]

WordNet (r) 3.0 (2006):

catecholamine
    n 1: any of a group of chemicals including epinephrine and
         norepinephrine that are produced in the medulla of the
         adrenal gland