Know how to use "fewer" and "less"? Find out.
type of hormone, from catechol (1880), from catechu, 17c. name for an astringent substance used in medicines, dyeing, etc., which apparently is from Malay kachu.
catecholamine cat·e·cho·la·mine (kāt'ĭ-kō'lə-mēn', -kô'-)
Any of a group of amines composed of a pyrocatechol molecule and the aliphatic portion of an amine that have important physiological effects as neurotransmitters and hormones, such as epinephrine, norepinephrine, and L-dopa.