superimpregnation


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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.
Synonym(s): hypercyesis, hypercyesia, multifetation, superimpregnation

superimpregnation

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