[ton-uh-plast, toh-nuh-]
noun Botany.
a membrane separating a vacuole from the surrounding cytoplasm in a plant cell.
Also called vacuolar membrane.

1885–90; tono- + -plast Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tonoplast (ˈtəʊnəˌplæst)
botany the membrane enclosing a vacuole in a plant cell
[C20: from Greek tonos tone + -plast]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

tonoplast to·no·plast (tō'nə-plāst')
An intracellular structure or vacuole.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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