superfetation

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superfetation

 [soo″per-fe-ta´shun]
the fertilization of an ovum and subsequent development of another embryo (fetus) when one is already present in the uterus, a result of fertilization of ova during different menstrual cycles, yielding fetuses of different ages.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

su·per·fe·ta·tion

(sū'pĕr-fe-tā'shŭn),
The presence of two fetuses of different ages, not twins, in the uterus, due to the impregnation of two ova liberated at successive periods of ovulation; an obsolete concept.
Farlex Partner Medical Dictionary © Farlex 2012

superfetation

(so͞o′pər-fē-tā′shən)
n.
Formation or development of a second fetus when one is already present in the uterus, occurring normally in certain vertebrate species.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

superfetation

Obstetrics Fertilization and subsequent development of a 2nd ovum after the 1st has already implanted in the uterus; superfetation provides the theoretic explanation for the difference in times of delivery of fraternal 'twins'. Cf Superfecundation.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

superfetation

The rare occurrence of two or more fetuses of different ages in a womb that are the result of fertilizations occurring in different menstrual cycles.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005