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The cytoplasmic membrane that surrounds a vacuole of a plant cell. Also called vacuolar membrane.

[Greek tonos, string, tension; see ten- in Indo-European roots + -plast.]
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.


(Botany) botany the membrane enclosing a vacuole in a plant cell
[C20: from Greek tonos tone + -plast]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈtɒn əˌplæst, ˈtoʊ nə-)

a membrane separating a vacuole from the surrounding cytoplasm in a plant cell.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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tonoplasts and endomembranes, H is the principal ion that is
Life with and without AtTIP1;1, an Arabidopsis aquaporin preferentially localized in the a opposing tonoplasts of adjacent vacuoles.
Otherwise, PIPs form primary channels mediating efficient water uptake and thereby control plasma membrane potentials of permeability, while TIPs, in addition to their high water transport capacity in tonoplasts [60] , also transport CO2 [13] and urea 12].