noun Botany.
the siliceous cell wall of a diatom.

1855–60; < French < Late Latin frustulum, diminutive of frustum frustum Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
frustule (ˈfrʌstjuːl)
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 & Unabridged 10th Edition
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American Heritage
Science Dictionary
frustule   (frŭs'chl)  Pronunciation Key 
The silica-rich cell wall of a diatom. Frustules are divided into two halves, and the intricate patterns of depressions and projections on each half help to identify individual diatom species.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Its frustule is a form of armor that can protect the diatoms from predators.
Each of these side buds develops into a tiny, cigar-shaped larva called a frustule.
All non-diatoms were counted and identified during this step as well as total viable diatom frustule number.
It nay often be overlooked because of its extremely delicate frustule, which is almost invisible even under phase optics.
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