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  1. within a cell or cells.

Origin of intracellular

First recorded in 1875–80; intra- + cellular
Related formsin·tra·cel·lu·lar·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for intracellular

Historical Examples

  • The "intracellular symbionts" of some Blattidae, their nature and behavior.

    The Biotic Associations of Cockroaches

    Louis M. Roth

  • The morphology and behavior of the intracellular bacteroids of roaches.

  • The intracellular bacteria of the cockroach in relation to symbiosis.

  • Many animals with intracellular luminescence have quite complicated luminous organs.

  • Obviously, the intracellular symbiotes subserve the normal nutrition of the cockroach.

British Dictionary definitions for intracellular


  1. biology situated or occurring inside a cell or cells
Derived Formsintracellularly, adverb
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 intracellular


1876, from intra- + cellular.

Online Etymology Dictionary, © 2010 Douglas Harper

intracellular in Medicine


  1. Occurring or situated within a cell or cells.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

intracellular in Science


  1. Occurring or situated within a cell or cells.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.