Main Entry: cat·e·chol·amine

Pronunciation: \ˌkat-ə-ˈkō-lə-ˌmēn, -ˈkȯ-\

Function: noun

: any of various amines (as epinephrine, norepinephrine, and dopamine) that contain a dihydroxy benzene ring, that are derived from tyrosine, and that function as hormones or neurotransmitters or both