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endoreduplication

[ĕn′dō-rĭ-dōō′plĭ-kā′shən]

n.

A form of polyploidy or polysomy characterized by redoubling of chromosomes, giving rise to four-stranded chromosomes at prophase and metaphase.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.