What do a.m. and p.m. stand for?


[fruhs-chool] /ˈfrʌs tʃul/
noun, Botany
the siliceous cell wall of a diatom.
Origin of frustule
1855-60; < French < Late Latin frustulum, diminutive of frustum frustum Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for frustule
  • 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.
British Dictionary definitions for frustule


(botany) the hard siliceous cell wall of a diatom
Word Origin
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
Cite This Source
frustule in Science
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.
Cite This Source

Word of the Day

Difficulty index for frustule

Few English speakers likely know this word

Word Value for frustule

Scrabble Words With Friends

Nearby words for frustule