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[mak-roh-noo-klee-uh s, -nyoo-] /ˌmæk roʊˈnu kli əs, -ˈnyu-/
noun, Biology.
the larger of the two types of nuclei occurring in ciliate protozoans, having a multiple set of chromosomes and functioning in cell metabolism and protein synthesis.
Compare micronucleus.
Origin of macronucleus
From New Latin, dating back to 1890-95; See origin at macro-, nucleus
Related forms
macronuclear, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for macronucleus


noun (pl) -clei (-klɪˌaɪ)
the larger of the two nuclei in ciliated protozoans Compare micronucleus
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
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macronucleus in Medicine

macronucleus mac·ro·nu·cle·us (māk'rō-nōō'klē-əs, -nyōō'-)
The larger of two nuclei present in ciliate protozoans, which controls the nonreproductive functions of the cell.

mac'ro·nu'cle·ar adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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