noun Cell Biology.
the readily stainable substance of a cell nucleus, consisting of DNA, RNA, and various proteins, that forms chromosomes during cell division.

1880–85; chromat- + -in2

chromatinic, adjective
chromatoid, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chromatin (ˈkrəʊmətɪn)
cytology euchromatin See also heterochromatin the part of the nucleus that consists of DNA and proteins, forms the chromosomes, and stains with basic dyes

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1882, from Ger. (1880), from Gk. khromat-, alt. comb. form of khroma "color" (see chromatic) + chemical suffix -in.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

chromatin chro·ma·tin (krō'mə-tĭn)
A complex of nucleic acids and proteins in the cell nucleus that stains readily with basic dyes and condenses to form chromosomes during cell division.

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
chromatin   (krō'mə-tĭn)  Pronunciation Key 
The substance distributed in the nucleus of a cell that condenses to form chromosomes during cell division. It consists mainly of DNA and proteins called histones.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They are recognized by chromatin regulator proteins that perform the tasks
  indicated by each kind of mark.
Intriguingly, this suggested that the two forms of chromatin were fractal in
  different ways.
Chromatin transfer tries to produce a cloned embryo that more closely resembles
  a normal embryo.
Chromatin undergoes various forms of change in its structure.
Image for chromatin
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