pronucleus

pronucleus definition - medical

pro·nu·cle·us (prō-no͞oˈklē-əs)

noun
  1. One of two nuclei undergoing fusion in karyogamy.
  2. The haploid nucleus of a sperm or egg before fusion of the nuclei in fertilization.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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