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The third stage of the prophase of meiosis, during which the homologous chromosomes become short and thick and divide into four distinct chromatids.
[French pachytène : Greek pakhus, thick + French -tène, ribbon (from Latin taenia; see taenia).]
(Biology) the third stage of the prophase of meiosis during which the chromosomes become shorter and thicker and divide into chromatids
[from Greek pakhus thick + tainia band]
pach•y•tene(ˈpæk ɪ tin)
the third stage of prophase in meiosis, during which each chromosome pair separates into sister chromatids with some breakage and crossing over of genes.
[< French pachytène (1900) = Greek pachý(s) thick + French -tène -tene]