• synonyms


[sahy-tuh-plaz-uh m]
noun Cell Biology.
  1. the cell substance between the cell membrane and the nucleus, containing the cytosol, organelles, cytoskeleton, and various particles.
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Origin of cytoplasm

First recorded in 1870–75; cyto- + -plasm
Related formscy·to·plas·mic, adjectivecy·to·plas·mi·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for cytoplasm

Historical Examples of cytoplasm

British Dictionary definitions for cytoplasm


  1. the protoplasm of a cell contained within the cell membrane but excluding the nucleus: contains organelles, vesicles, and other inclusions
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Derived Formscytoplasmic, adjective
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

Word Origin and History for cytoplasm


1874, from cyto- + -plasm.

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Online Etymology Dictionary, © 2010 Douglas Harper

cytoplasm in Medicine


  1. The protoplasm outside a cell nucleus.
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Related formscy′to•plasmic (-plăzmĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

cytoplasm in Science


  1. The jellylike material that makes up much of a cell inside the cell membrane, and, in eukaryotic cells, surrounds the nucleus. The organelles of eukaryotic cells, such as mitochondria, the endoplasmic reticulum, and (in green plants) chloroplasts, are contained in the cytoplasm. The cytoplasm and the nucleus make up the cell's protoplasm. See more at cell.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

cytoplasm in Culture



The material within a biological cell that is not contained in the nucleus or other organelles.

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.