Term: noradrenaline: a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses
Broader: vasoconstrictor: any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure | Unrelated: creeping zinnia: low-branching leafy annual with flower heads resembling zinnias; found in southwestern United States and Mexico to Guatemala