[ pē′tərz, pā′tərs ]
A fertilized ovum that is 13 to 14 days into its development.
What Are Some Words For Sibling Pairs?These days, giving birth to twins is increasingly common. As many as 5 out of every 1,000 babies born shared a womb with their sibling. While cute and adorable are some starter words to use when welcoming new babies, here's a look at the lexicon to haul out when welcoming multiples!
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.