superfetation

su·per·fe·ta·tion  (spr-f-tshn)

n.

Formation or development of a second fetus when one is already present in the uterus, occurring normally in some animal species.

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superfetation

a conception occurring after the onset of a pregnancy from an earlier conception.

See also: Birth

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a conception occurring during a pregnancy from an earlier conception.

See also: Biology

Thesaurus

Noun

1.

superfetation - fertilization of a second ovum after a pregnancy has begun; results in two fetuses of different ages in the uterus at the same time; "superfetation is normal in some animal species" fecundation, fertilisation, fertilization, impregnation - creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant