- the siliceous cell wall of a diatom.
Origin of frustule
1855–60; < French < Late Latin frustulum, diminutive of frustum frustum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for frustule
Frustule, frus′tūl, n. the siliceous two-valved shell of a diatom, with its contents.
Frustule lanceolate, truncate; zone with numerous divisions.
Frustule membranaceous, elliptical, truncate, with broad ends.
Median lines not on the same side of each valve of the frustule.
In one frustule I noticed one valve with one stigma and the other with four stigmas.
- 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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.