ATPase

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ATP·ase

 (ā′tē-pē′ās, -āz)
n.
An enzyme that catalyzes the formation of ATP from ADP, inorganic phosphate, and energy, found in mitochondria and chloroplasts; adenosine triphosphatase. Also called ATP synthase.
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.

ATPase

(ˌeɪtiːˈpiːˌeɪz)
n
1. (Biochemistry) adenosine triphosphatase; an enzyme that converts ATP to ADP
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ATPase

(ˈeɪˈtiˈpi eɪs, -eɪz)

n.
adenosine triphosphatase: any of several enzymes that catalyze the hydrolysis of ATP to ADP and phosphate.
[1945–50]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.