endoreduplication en·do·re·du·pli·ca·tion (ěn'dō-rĭ-d&oomacr;'plĭ-kā'shən, -dy&oomacr;'-) n. A form of polyploidy or polysomy characterized by redoubling of chromosomes, giving rise to four-stranded chromosomes at prophase and metaphase.
