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Related to macronuclei: macronuclear, Meganucleus


 (măk′rō-no͞o′klē-əs, -nyo͞o′-)
n. pl. mac·ro·nu·cle·i (-klē-ī′)
The larger of two nuclei present in ciliate protozoans, which controls nonreproductive functions of the cell, such as metabolism.

mac′ro·nu′cle·ar adj.
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.


n, pl -clei (-klɪˌaɪ)
(Microbiology) the larger of the two nuclei in ciliated protozoans. Compare micronucleus
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌmæk roʊˈnu kli əs, -ˈnyu-)

the larger of the two types of nuclei in ciliate protozoans, functioning in cell metabolism. Compare micronucleus.
mac`ro•nu′cle•ar, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
A histopathological examination of the endoscopic biopsies revealed infiltration of neoplastic cells with eosinophilic macronuclei and pleomorphic islands.
A urelia il DNA sequence in Paramecium macronuclei is related to the [beta] subunit of G proteins.
One thousand binucleated (BN) cells with two macronuclei surrounded by cytoplasm were scored from each patient and control subject.
Atypical cells with pleomorphic macronuclei containing dense chromatin forming an irregular glandular structure were identified towards the lumen in the superficial layer (Figure 4(a), red square, and Figure 4(d)).