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macronucleus

American  
[mak-roh-noo-klee-uhs, -nyoo-] / ˌmæk roʊˈnu kli əs, -ˈnyu- /

noun

Biology.
  1. 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.


macronucleus British  
/ ˌmækrəʊˈnjuːklɪəs /

noun

  1. 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

Other Word Forms

  • macronuclear adjective

Etymology

Origin of macronucleus

From New Latin, dating back to 1890–95; see origin at macro-, nucleus

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Inside are food vacuoles, a large macronucleus, and a small micronucleus.

From Textbooks • Jan. 1, 2015

The original macronucleus dissolves, and four of the micronuclei become macronuclei.

From Textbooks • Jan. 1, 2015

The clear spot to the right is the macronucleus, and the blobs are probably storage granules of some sort.

From Scientific American • Oct. 17, 2013

The macronucleus is made from the micronucleus, but it is not at all the same in content.

From New York Times • Feb. 10, 2010

The macronucleus is spherical, elongate, band-formed or horseshoe-shaped.

From Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 by Calkins, Gary N. (Gary Nathan)