is·en·tro·pic
(ī′sən-trō′pĭk, -trŏp′ĭk)adj. Without change in entropy; at constant entropy.
is′en·tro′pi·cal·ly adv.
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.
isentropically
(ˌaɪsɛnˈtrɒpɪkəlɪ) advin an isentropic manner
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014