superfetation


Also found in: Dictionary, Thesaurus, Legal, Wikipedia.

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.

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.

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.

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.

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.
References in periodicals archive ?
"I ended up being transferred to a specialised children's hospital in nearby Little Rock, where even though the team of doctors had never delivered superfetation babies, they had at least studied the rarity of it in medical journals."
At each census, [sim]10% of the total number of females in each tank were sampled to measure the proportion gravid, the number of broods carried simultaneously (a measure of superfetation), the number and mass of embryos in each developmental stage, and the overall proportion of biomass devoted to reproduction.
formosa by the combined effects of the plasticity of female size at maturity, matrotrophy, and superfetation in response to density.
milleri are similar to those of other members of the tribe Gambusiini (e.g., no superfetation; but see Pires et al.
However, to confirm a case of superfetation, doctors need to conduct chromosomal and metabolic tests on the babies after they are born.
Seemingly, superfetation is so rare that Boyle has heard of only 10 reported cases.
Superfetation occurs when eggs from two different menstrual cycles are released and fertilised separately.
First, they are excellent colonizers; a single gravid female can found a new population due to superfetation (Parenti 1998).
It was proved thereafter that the second child was Allen's biological son - a result of something called "superfetation." However, it is not clear in the reports how that could happen.
For Ame was conceived three weeks after Lia due to a rare event called superfetation. Mum Amelia Spence went on producing eggs despite having already conceived Lia.
Doctors suspect she has a rare condition called superfetation, which means conceiving when already pregnant.