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 (frŭs′cho͞ol, -tyo͞ol)
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


(ˈfrʌs tʃul)

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.
References in periodicals archive ?
For example, Beninger and Decottignies (2005) used live and dead cells of the diatom (Coscinodiscus perforatus), whose epicellular frustules had been left intact and uncleaned, and found that all cells were handled similarly for the bivalve (Pecten maximus).
Silica is needed by a group of marine algae (the microscopic plants of the oceans) called diatoms, who use it to build their glassy cell walls (known as frustules).
Relative species composition of diatom assemblages was difficult to obtain because diatom distribution was scarce and frustules were hard to detect.
Elliptical and elongated frustules are common, different species can be observed (Fig.
Naturally occurring diatom frustules are a source of nanomaterials.
The possession of several asexual reproductive and resting forms, such as a budding polyp, mobile frustules or podocysts allows it dispersion via co-transportation of resting stages with plants, fish and humans (Dumont, 1994), which in turn results in log-term survival without sexual reproduction (Fritz et al., 2007).
Diatomaceous earth (DE) is a material with sedimentary origin, basically constituted of skeletons or frustules, being friable, porous and fine.
More importantly, EDX spectrum revealed the dominating presence of silicon (Si), present in a small amount in the SS bulk (Table 1), which mainly originates from the diatom frustules (Figure 3).
Among the algae, diatoms have the advantage of being easy to collect and store due to their hard frustules. They also respond rapidly to changes in environmental variables such as light, pH, temperature and nutrients [14].