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second messenger

noun, Biochemistry.
any of various intracellular chemical substances, as cyclic AMP, that transmit and amplify the messages delivered by a first messenger to specific receptors on the cell surface.
Compare first messenger.
Origin of second messenger
1960-65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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second-messenger in Culture

second messenger definition

A molecule that relays messages in a cell from a receptor on a cell membrane to the final destination where an action within the cell is to take place. (See signal transduction pathway.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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