abscisic acid

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ab·scis·ic acid

 (ăb-sĭz′ĭk)
n.
A plant hormone, C15H20O4, that regulates the abscission of leaves, flowers, and fruits, the dormancy of buds and seeds, and other developmental processes and stress responses.
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.

abscisic acid

(æbˈsɪsɪk)
n
a type of acid that causes abscission
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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The stomata of sunflower crop were particularly closed due to spray of absciscic acid, which proved beneficial in protecting the plant tissues from dehydration.