-ergic

-ergic

suff.
Activated or produced by: cholinergic.
[Greek ergon, work; see werg- in Indo-European roots + -ic.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

-ergic

a combining form with the meanings “activated by,” “sensitive to,” “releasing,” “resembling the effect produced by” the substance or phenomenon specified by the initial element: dopaminergic.
[appar. orig. in adrenergic and cholinergic, probably on the model of allergic]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.