cell wall

noun Biology.
the definite boundary or wall that is part of the outer structure of certain cells, as a plant cell.

Origin:
1840–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
cell wall
 
n
the outer layer of a cell, esp the structure in plant cells that consists of cellulose, lignin, etc, and gives mechanical support to the cell

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

cell wall n.
The rigid outermost cell layer found in plants and certain algae, bacteria, and fungi but characteristically absent from animal cells.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
cell wall  
The outermost layer of cells in plants, bacteria, fungi, and many algae that gives shape to the cell and protects it from infection. In plants, the cell wall is made up mostly of cellulose, determines tissue texture, and often is crucial to cell function. Compare cell membrane.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

cell wall definition


The rigid outer covering of a typical plant cell, composed mainly of cellulose and lying outside the cell membrane. Animal cells do not have cell walls.

Note: It is the cell walls that give plant stems and wood their stiffness.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
It resides almost exclusively intra-cellularly without a cell wall.
In several portions of the specimen two or three generations of cells are seen
  enclosed in a parent cell wall.
Once there, they begin spreading a witches' brew of toxins produced by the
  bacteria or formed from the bacterial cell wall.
Vancomycin operates by binding to the bacterial cell wall and interfering with
  cell wall growth.
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