[mak-roh-noo-klee-uh s, -nyoo-]
- 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.
Origin of macronucleus
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for macronucleus
Macronucleus central, globular to elongate, sometimes double.
The macronucleus is spherical and has one micronucleus attached.
The macronucleus is long and beaded and placed upon the right side.
The macronucleus is spherical and usually central in position.
The macronucleus is long and band-formed or horseshoe shape.
- the larger of the two nuclei in ciliated protozoansCompare 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
- The larger of two nuclei present in ciliate protozoans, which controls the nonreproductive functions of the cell.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.