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intr.v. ni·dat·ed, ni·dat·ing, ni·dates
To become implanted in the uterus. Used of a fertilized cell.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Physiology) embryol (of a new embryo) to undergo nidation, to implant (oneself) in the uterus
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014