Century Dictionary and Cyclopedia
- Having no placenta; not placental; specifically, pertaining to the Implacentalia or having their characters. Also implacentate.
- n. An implacental mammal, as a marsupial or a monotreme.
- adj. zoology Without a placenta, as marsupials and monotremes.
- n. zoology A mammal having no placenta.
GNU Webster's 1913
- adj. (Zoöl.) Without a placenta, as marsupials and monotremes; nonplacental.
- im- + placental? (Wiktionary)
“Lemuroid and the higher forms of primates; for those between the original primate and other root-forms of placental mammals; for those between primary placental and implacental mammals, and perhaps also for the divergence of the most ancient stock of these and of the monotremes, for in all these cases modifications of structure appear to increase in complexity in at least that ratio.”
“Remarkable similarities between certain placental and implacental mammals, between the bird's-head processes of”
“Again, the implacental mammals, including the Ornithodelphia and the Marsupials, are admitted to be lower than the placental series.”
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