biogenic amine

[ bī′ō-jĕnĭk ]

n.

Any of a group of naturally occurring, biologically active amines, such as serotonin, that act primarily as neurotransmitters and are capable of affecting mental functioning.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.