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Related to frustule: diatom
The hard, siliceous bivalve shell of a diatom.
[French, from Latin frūstulum, diminutive of frūstum, piece broken off.]
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 hard siliceous cell wall of a diatom
[C19: from French, from Late Latin frustulum a small piece, from frustum a bit]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the shell of a diatom.
[1855–60; < French < Late Latin]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.