noun Cell Biology.
the third stage of prophase in meiosis, during which each chromosome pair separates into sister chromatids with some breakage and crossing over of genes.
Also pach·y·ne·ma [pak-uh-nee-muh] /ˌpæk əˈni mə/.
Origin of pachytene
< French pachytène (1900), equivalent to Greek pachý(s) thick + -tène -tene
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the third stage of the prophase of meiosis during which the chromosomes become shorter and thicker and divide into chromatids
Word Origin for pachytene
from Greek pakhus thick + tainia band
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 third stage of the prophase of meiosis during which the homologous chromosomes become short and thick and divide into four distinct chromatids.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.