[en-duh-spawr, -spohr]


Botany, Mycology. the inner coat of a spore.Compare intine.
Bacteriology. a spore formed within a cell of a rod-shaped organism.

Origin of endospore

First recorded in 1870–75; endo- + spore
Related formsen·dos·por·ous [en-dos-per-uh s, en-doh-spawr-, -spohr-] /ɛnˈdɒs pər əs, ˌɛn doʊˈspɔr-, -ˈspoʊr-/, adjectiveen·dos·por·ous·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for endospore

Historical Examples of endospore

  • When the spore is coloured, the external membrane alone appears to possess colour, the endospore being constantly hyaline.

    Fungi: Their Nature and Uses

    Mordecai Cubitt Cooke

British Dictionary definitions for endospore



a small asexual spore produced by some bacteria and algae
the innermost wall of a spore or pollen grain
Derived Formsendosporous (ɛnˈdɒspərəs, ˌɛndəʊˈspɔːrəs), 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 endospore

1859, perhaps from French, from endo- + spore.

Online Etymology Dictionary, © 2010 Douglas Harper

endospore in Medicine




A small spore formed within the vegetative cells of some bacteria.
A fungus spore borne within a cell or within the tubular end of a sporophore.
The inner layer of the wall of a spore.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

endospore in Science



A rounded, inactive form that certain bacteria assume under conditions of extreme temperature, dryness, or lack of food. The bacterium develops a waterproof cell wall that protects it from being dried out or damaged. Bacteria have been known to remain dormant but alive in the form of endospores for long periods of time, even thousands of years. Also called endosporium
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.