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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Reduction of the diploid number of chromosomes by one half during meiosis, resulting in the haploid number.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The halving of the number of chromosomes during meiosis, resulting in the haploid number

Etymologies

Greek haplous, single; see haploid + -osis.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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