American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
In early spring, it is common for bunnies to give birth to large litters and even conceive a second litter while pregnant with the first via the process of superfetation.— The Journal
Marcellus Donatus, Goret, Schacher, and Mauriceau mention superfetation.— Anomalies and Curiosities of Medicine
Baudeloque speaks of a case of superfetation observed by Desgranges in— Anomalies and Curiosities of Medicine
Argles mentions simultaneous extrauterine fetation and superfetation.— Anomalies and Curiosities of Medicine
In this strange case, possibly an example of superfetation, the patient made a good recovery and the first child lived.— Anomalies and Curiosities of Medicine

Century Dictionary (1)
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