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An irregular aggregation of chromatin in the nucleus of a cell not undergoing mitosis.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Biology) any of the dense aggregates of chromatin in the nucleus of a cell
2. (Biology) the nucleus of a cell
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈkær i əˌsoʊm)

any of several masses of chromatin in the reticulum of a cell nucleus.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Furthermore, according to their cellular characteristics, 11 oocytes substages were distinguished: 1) oogonia (Og), 2) chromatin nucleolus (Cn), 3) early perinucleolus (Pn1), 4) late perinucleolus (Pn2), 5) oil globule (Li), 6) yolk globule (yg), 7) early vitellin globule (Ev1), 8) late vitellin globule (Vo2), 9) postvitelogenic (Pvo), 10) germinal vesicle migration (Gvm), and 11) germinal vesicle breakdown (Gvb) (Fig.
Oogonial proliferation and progressive morphological changes in the ooplasm of the oocytes were used to classify oogenesis in distinct stages that included oogonial proliferation, chromatin nucleolus, primary growth and secondary growth (vitellogenesis).
The Chromatin nucleolus oocytes (STAGE I) (Figure 1) were the smallest oocytes, appearing grouped in 'clusters of germ cells' (CG) inserted in ovigerous lamellae in vascularized areas, with average diameter ([+ or -] SD) of 9.5 [+ or -] 4.46 [micro]m (Figure 5).