The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
An adrenergic blocking agent, C17H19N3O, used especially in the diagnosis and treatment of pheochromocytoma.
Origin: phen(o)- + tol(uidine) + amine.